Battery cell, battery device and electric device

Abstract

The utility model relates to the field of batteries, and discloses a battery monomer, a battery device and a power utilization device, the battery monomer comprises a shell part, an electrode part and a pole part, the electrode part is arranged in the shell part, the shell part comprises a first shell wall, and the pole part is arranged on the first shell wall and comprises a pole body connected with the electrode part; the clamping structure surrounds the pole body and is connected with the first shell wall; the insulation sealing structure is in insulation and sealing fit between the clamping structure and the pole body; the clamping structure comprises a first clamping piece and a second clamping piece, and at least one of the first clamping piece and the second clamping piece is bent towards the other to form a clamping groove together; the clamping groove clamps the pole body, a notch is formed in the clamping groove, and the clamping groove is tightened at the notch; in the thickness direction of the first shell wall, the ratio of the minimum size of the notch to the maximum size of the clamping groove is smaller than 90%. According to the utility model, the connection of the insulation sealing structure between the pole body and the clamping structure is tighter, and the reliability of the single battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery monomer, a battery device and an electric device. Background Art

[0002] A battery device generally consists of a box and multiple battery cells contained in the box. As the core component of the battery device, the battery cell has high requirements in terms of safety and service life. To ensure the stability of the battery cell, the outer shell of the battery cell and the external environment need to have a high degree of sealing. Therefore, how to further improve the sealing of the battery cell and the external environment has become one of the problems that need to be solved. Utility Model Content

[0003] The embodiments of the present application provide a battery cell, a battery device and an electrical device, which can effectively improve the performance and service life of the battery cell and the battery device.

[0004] In the first aspect, an embodiment of the present application provides a battery cell, comprising a shell component, an electrode component and a pole component, the electrode component is arranged in the shell component, the shell component comprises a first shell wall, the pole component is arranged in the first shell wall and comprises: a pole body, connected to the electrode component; a clamping structure, surrounding the pole body and connected to the first shell wall; an insulating sealing structure, insulated and sealed between the clamping structure and the pole body; wherein the clamping structure comprises a first clamping piece and a second clamping piece connected and arranged, at least one of the first clamping piece and the second clamping piece is bent toward the other to jointly form a clamping groove; the clamping groove clamps the pole body, the clamping groove is formed with a notch, and the clamping groove is tightened at the notch to prevent the pole body from escaping from the notch; wherein, along the thickness direction of the first shell wall, the ratio of the minimum size of the notch to the maximum size of the clamping groove is less than 90%.

[0005] In the above technical solution, the pole part of the above structure is adopted, and the pole body can be clamped and fixed by the insulating sealing structure and the clamping structure, and then connected to the first shell wall of the shell part by the clamping structure, thereby reducing the risk of contact between the pole body and the shell part during the assembly of the battery cell, reducing the probability of damage to the pole body, and being conducive to ensuring the integrity of the pole body, improving the reliability of the pole body overcurrent, and improving the reliability of the battery cell. The clamping groove formed by the first clamping member and the second clamping member can clamp the insulating sealing structure and the pole body more firmly, and the clamping structure is not easy to be stretched open, thereby improving the installation reliability of the insulating sealing structure and the pole body, which is conducive to improving the overall stability of the pole part, and can also increase the compression of the insulating sealing structure, improve the insulation and sealing between the clamping structure and the pole body, thereby improving the reliability of the pole part, and further improve the reliability of the battery cell.

[0006] In some embodiments of the present application, the first clamping member includes a first arm portion, a second arm portion, and a third arm portion that are bent and connected in sequence, the first arm portion is connected to the second clamping member and extends in a direction away from the second clamping member, and at least one of the second arm portion and the third arm portion is extended and arranged gradually approaching the second clamping member; the first arm portion, the second arm portion, and the third arm portion together form a clamping groove with the second clamping member, and the end of the third arm portion away from the second arm portion and the end of the second clamping member away from the first arm portion together form a notch.

[0007] In the above technical solution, since the first arm, the second arm and the third arm are bent and connected in sequence, the first clamping member can form a clamping groove that is wide inside and narrow outside, and the inner space of the clamping groove is relatively ample, and the pole body can be closer to the inner side of the clamping groove, thereby the size of the portion where the pole body and the clamping groove are combined is larger, which can improve the installation reliability of the pole body. The above structure can also make the arrangement between the pole body and the clamping groove more compact, reduce the volume of the pole component, and help improve the volume energy density of the battery cell.

[0008] In some embodiments of the present application, the second arm is arranged parallel to the first shell wall, and the second arm is bent and connected to the first arm and the third arm; or, the second arm is an arc-shaped arm, which is bent and connected to the first arm and the third arm.

[0009] In the above technical solution, the first clamp adopts the above bending structure to improve its own strength and rigidity. When the pole body is subjected to the force from the electrode component to the first shell wall, the first clamp has a better effect of resisting deformation, which can reduce the probability of the pole body detaching from the clamping structure due to large deformation, which is beneficial to improving the overall reliability of the pole component. In addition, the above structure can provide more implementation plans for the first clamp, which can increase design flexibility and help meet different product requirements.

[0010] In some embodiments of the present application, the third arm portion is arranged at an angle relative to the first arm portion and the first shell wall; or, the third arm portion is arranged parallel to the first arm portion and is arranged at an angle relative to the first shell wall.

[0011] In the above technical solution, the third arm is arranged at an angle relative to the first arm and the first shell wall. This structure can make the bending structure of the first clamping member relatively simple, reduce the difficulty of forming, improve manufacturability, and improve product yield. The third arm is arranged parallel to the first arm and is arranged at an angle relative to the first shell wall, so that the distance between the third arm and the first arm is relatively small, and the first arm needs to be more deformed relative to the third arm to make the pole body detach from the clamping structure. This can increase the difficulty of the pole body detaching from the clamping structure, thereby improving the clamping reliability of the clamping structure on the pole body, thereby improving the overall reliability of the pole body, and thereby improving the reliability of the battery cell.

[0012] In some embodiments of the present application, the first arm portion is disposed perpendicular to the first shell wall.

[0013] In the above technical solution, the structure in which the first arm is arranged perpendicular to the first shell wall can reduce the compressive force arm of the clamping structure on the insulating sealing structure, enhance the compressive effect of the first clamping member on the insulating sealing structure, enhance the insulation and sealing effect, and help improve the insulation and sealing reliability of the insulating sealing structure and the reliability of the battery cell as a whole. On the other hand, the above structure can also make the structure of the clamping structure more compact, thereby making the overall structure of the pole part more compact, so that the side of the pole body away from the electrode part can have a larger surface, which is conducive to increasing the flow area of ​​the pole body and improving the current carrying capacity of the pole body, thereby helping to improve the charging and discharging performance of the battery cell.

[0014] In some embodiments of the present application, the second clamping member includes a fourth arm portion, the fourth arm portion is parallel to the first shell wall, and forms a clamping groove together with the first clamping member.

[0015] In the above technical solution, the fourth arm portion is relatively close to the inner side of the shell component. By making the fourth arm portion parallel to the first shell wall, the fourth arm portion can be arranged more compactly in the shell component, saving the internal space of the shell component. This is conducive to increasing the size of the electrode component and improving the volume energy density of the battery cell.

[0016] In some embodiments of the present application, the second clamping member further includes a fifth arm portion, which is bent and connected to the fourth arm portion and extends in a direction approaching the first clamping member.

[0017] In the above technical solution, since the third arm is bent relative to the second arm, on this basis, the fifth arm is bent and connected with the fourth arm, so that the first clamping member and the second clamping member can form a protruding structure protruding in the direction of each other, which can further increase the clamping force on the pole body and further improve the installation reliability of the pole body. The above structure can, on the one hand, further increase the extrusion force on the insulating sealing structure, increase the compression amount of the insulating sealing structure, and improve the insulation and sealing of the insulating sealing structure between the pole body and the clamping structure. On the other hand, the protruding structure formed by the first clamping member and the second clamping member can increase the complexity of the insulation and sealing path of the insulating sealing structure, which is conducive to increasing the contact surface between the insulating sealing structure and the first clamping member and the second clamping member, thereby enhancing the insulation and sealing of the insulating sealing structure between the pole body and the clamping structure, reducing the risk of electrolyte leakage from the pole component, and improving the reliability of the battery cell.

[0018] In some embodiments of the present application, the fifth arm portion is perpendicular to the first shell wall.

[0019] In the above technical solution, since the fourth arm is parallel to the first shell wall, and on this basis, the fifth arm is perpendicular to the first shell wall, it can be understood that the fifth arm is perpendicular to the fourth arm. In this way, the overall structure of the second clamp is more compact, and the size of the fifth arm can be made relatively small, which is conducive to saving space and reducing the overall volume of the pole component. On the other hand, the fifth arm is perpendicular to the fourth arm, so that the second clamp can form a vertical structure, which can improve the overall strength and rigidity of the second clamp, enhance the fixing effect on the insulating sealing structure and the pole body, improve the overall reliability of the pole component, and then improve the overall reliability of the battery cell.

[0020] In some embodiments of the present application, the pole body includes a main body and an edge portion connected to the main body, and the edge portion is located in the clamping groove. In this technical solution, the edge portion of the pole body is clamped and matched with the clamping groove formed by the clamping structure, and the main body can be exposed outside the clamping groove and connected to other conductive components such as the busbar, and the main body is easy to keep flush with the surface of the clamping structure away from the first shell wall, or maintain a small height difference, which is conducive to making the overall shape of the pole component more regular, and it is also easier to connect the pole body with other connecting components such as the busbar, wire or bar.

[0021] In some embodiments of the present application, the edge portion is bent relative to the main body as a whole. By bending the edge portion relative to the main body as a whole, the overall strength and rigidity of the edge portion can be improved, which is beneficial to improving the strength and rigidity of the structure formed after the edge portion and the clamping structure are combined, and the reliability of the overall structure of the pole component can be improved. Since the edge portion has a bending position, this method can increase the complexity of the insulating sealing path at the position where the insulating sealing structure and the edge portion are combined, and the area of ​​the contact surface can be increased, thereby enhancing the insulation and sealing between the clamping structure and the edge portion, reducing the risk of electrolyte leakage at the location of the pole component, and also helping to improve the reliability of the battery cell.

[0022] In some embodiments of the present application, the edge portion is at least partially arranged parallel to the third arm portion.

[0023] In the above technical solution, the edge portion is at least partially arranged parallel to the third arm portion, and the distance between the edge portion and the third arm portion is relatively small. In this way, the compression amount of the part of the insulating sealing structure located between the edge portion and the third arm portion can be kept consistent, and it is conducive to maintaining a larger compression amount, which can improve the stability and reliability of insulation and sealing, reduce the risk of electrolyte leakage, and improve the reliability of the battery cell.

[0024] In some embodiments of the present application, a first recessed portion is formed on the edge portion, and the third arm portion cooperates with the first recessed portion.

[0025] In the above technical solution, the third arm cooperates with the first recessed portion through the insulating sealing structure, thereby making the first clamping member and the edge portion more tightly coupled, thereby enhancing the clamping strength of the clamping structure on the edge portion and improving the installation reliability of the pole body. The first recessed portion can also increase the complexity of the contact surface between the edge portion and the insulating sealing structure and increase the area of ​​the contact surface, thereby enhancing the insulation and sealing of the insulating sealing structure between the edge portion and the first clamping member, thereby also improving the reliability of the battery cell.

[0026] In some embodiments of the present application, the third arm portion is protruding relative to the second arm portion in a direction close to one side of the first recessed portion, and is insulated and sealedly connected to the first recessed portion via an insulating sealing structure.

[0027] In the above technical solution, the third arm portion is protruded relative to the second arm portion in the direction close to the first recessed portion, so that the distance between the third arm portion and the first recessed portion is reduced, thereby further clamping the insulating sealing structure and the edge portion, improving the installation reliability of the insulating sealing structure and the pole body, and thus improving the overall reliability of the pole component. Since the first recessed portion can increase the complexity and area of ​​the contact surface between the edge portion and the insulating sealing structure, on this basis, the above structure can increase the complexity and area of ​​the contact surface between the insulating sealing structure and the first clamping member, and further enhance the insulating sealing structure at the first clamping member and the edge portion, improve the insulation and sealing properties of the pole component, and thus improve the overall reliability of the battery cell.

[0028] In some embodiments of the present application, a second recessed portion is further formed on the edge portion, and the second clamping member cooperates with the second recessed portion. In the above technical solution, the second clamping member can cooperate with the second recessed portion through the insulating sealing structure, thereby making the second clamping member and the edge portion more tightly coupled, thereby enhancing the clamping strength of the second clamping member on the edge portion and improving the installation reliability of the pole body. The second recessed portion can also increase the complexity of the contact surface between the edge portion and the insulating sealing structure, and increase the area of ​​the contact surface, thereby enhancing the insulation and sealing of the insulating sealing structure between the edge portion and the second clamping member, thereby also improving the reliability of the battery cell.

[0029] In some embodiments of the present application, the second clamping member includes a fourth arm portion and a fifth arm portion that are connected to each other, the fourth arm portion is connected to the first arm portion, the fifth arm portion protrudes toward the side close to the second recessed portion, and is insulated and sealed from the second recessed portion by an insulating sealing structure.

[0030] In the above technical solution, the fifth arm portion can form a convex structure of the second clamping member, and can be matched and connected with the second concave portion of the edge portion through the insulating sealing structure. With this structure, the second clamping member and the edge portion can be connected in a meshing manner, which can improve the connection strength and reliability of the second clamping member and the edge portion. The above structure can also make the insulating and sealing path of the insulating sealing structure between the second clamping member and the edge portion to be tortuous and form a structure similar to an "S" shape, which can increase the complexity and area of ​​the contact surface between the insulating sealing structure, the second clamping member, and the insulating sealing structure and the edge portion, thereby improving the insulation and sealing of the pole component as a whole, and further improving the reliability of the battery cell as a whole.

[0031] In some embodiments of the present application, the local thickness of the edge portion is thinned to form the first recessed portion and / or the second recessed portion. In the above technical solution, the first recessed portion and / or the second recessed portion are formed in the above manner, which is easy to process and manufacture, can improve manufacturability, improve production efficiency, and reduce costs.

[0032] In some embodiments of the present application, the insulating sealing structure includes a first sealing member, and the first sealing member is sealingly disposed between the second clamping member and the pole body. In the above technical solution, the first sealing member can play a sealing role between the second clamping member and the pole body, reduce the risk of electrolyte leakage from between the second clamping member and the pole body, improve the sealing of the pole component, and thus improve the reliability of the battery cell.

[0033] In some embodiments of the present application, the first seal includes a first part and a second part that are bent and connected, the pole body includes a main body and an edge portion, the first part is sealed between the main body and the second clamping member, and the second part is sealed between the edge portion and the second clamping member.

[0034] In the above technical solution, the first part can play a sealing role between the main body and the second clamping member, and the second part can play a sealing role between the edge and the second clamping member, so that the first seal can have a larger sealing surface, and the sealing between the second clamping member and the pole body can be enhanced. In addition, the above structure also makes the first seal L-shaped, which can also increase the contact surface with the second clamping member and combine more tightly, which can improve the installation reliability of the first seal and the second clamping member, reduce the risk of displacement or separation of the first seal during assembly, and thus improve the sealing reliability of the pole component, thereby improving the overall reliability of the battery cell.

[0035] In some embodiments of the present application, the pole component further includes an insulating structure insulated between the pole body and the electrode component, and the second part is integrally provided with the insulating structure.

[0036] In the above technical solution, the insulating structure can provide an effective insulating barrier on the side of the pole body close to the electrode component, isolate the pole body and the electrode component, reduce the risk of short circuit, and improve the stability and reliability of the battery cell. The insulating structure can also play a barrier role, blocking the electrolyte from flowing to the pole component, reducing the risk of electrolyte leakage, and is also conducive to maintaining a clean environment inside the shell component, which can ensure that the chemical reaction inside the battery cell can work normally. The insulating structure can also play a buffering role between the first shell wall and the electrode component, reducing the impact between the first shell wall and the electrode component, and the probability of damage to the electrode component, which can improve the reliability of the battery cell. By setting the second part and the insulating structure as one piece, the installation of the first seal and the insulating structure can be relatively simple, which can simplify the assembly process, reduce the assembly steps, and thus improve the production efficiency of the battery cell.

[0037] In some embodiments of the present application, the insulating sealing structure further includes a second sealing member, which is sealingly disposed between the first clamping member and the pole body, and the second sealing member is spaced apart from the first sealing member.

[0038] In the above technical solution, the second seal can be used as the first sealing line between the pole body and the clamping structure, and the first seal can be used as the second sealing line between the pole body and the clamping structure. The cooperation between the second seal and the first seal can provide more comprehensive sealing protection, further reduce the risk of electrolyte leakage from the pole component, and reduce the risk of external impurities such as water and dust entering the pole component, so as to improve the sealing reliability of the pole component, and thus improve the reliability of the battery cell. The second seal is spaced from the first seal, so that the space required for the second seal and the first seal to expand and deform can be provided, and the gas compressed by the second seal and the first seal can be stored, so as to reduce the probability of the clamping structure being damaged by the gas, improve the reliability of the pole component, and reduce the risk of the released gas contaminating the electrolyte, so as to ensure the stability of the chemical reaction inside the battery cell, which is conducive to improving the reliability of the battery cell.

[0039] In some embodiments of the present application, the insulating sealing structure further includes an insulating member, and the insulating member includes a first insulating portion, which is disposed between the first clamping member and the pole body.

[0040] In the above technical solution, the first insulating part can play an insulating role between the first clamping part and the pole body, reducing the risk of short circuit or other electrical safety accidents, and the first insulating part can also play a sealing role before the first sealing part. The first insulating part serves as a sealing line of defense, and the first sealing part serves as another sealing line of defense, thereby playing a double protection role, reducing the probability of electrolyte leakage from the inside of the shell component, and effectively resisting the intrusion of moisture and dust, thereby improving the reliability of the battery cell.

[0041] In some embodiments of the present application, the insulating member further includes a second insulating portion, which is disposed on an outer surface of the first clamping member away from the clamping groove and is connected to the first insulating portion.

[0042] In the above technical solution, the above structure can play an insulating protection role in the outer circumferential direction of the pole body, reduce the risk of electrical safety accidents such as short circuits, stabilize the surrounding electric field distribution, and reduce the probability of damage to the battery cell due to uneven electric field. Secondly, the second insulating part can also form a protective layer on the circumferential side of the first clamping member, which can play a buffering and vibration reduction role, thereby reducing the impact on the pole body and reducing the probability of damage to the pole body, thereby improving the reliability of the battery cell.

[0043] In some embodiments of the present application, the pole body includes a pole protrusion located in the inner ring area of ​​the first clamping member, the pole protrusion protrudes toward the outside of the first shell wall relative to the first clamping member, and the side surface of the pole protrusion away from the electrode component includes a central area and a peripheral area, the peripheral area is arranged around the central area, the central area protrudes toward the outside of the first shell wall relative to the peripheral area, and the side surface of the second insulating part away from the electrode component is flush with the peripheral area.

[0044] In the above technical solution, in the side surface of the pole outer protrusion away from the electrode component, the central area protrudes toward the outside of the first shell wall relative to the peripheral area, so that the central area is less obstructed by the peripheral side, and the central area is easy to connect with other electrical connection components such as busbars and bars. By making the side surface of the second insulating part away from the electrode component flush with the peripheral area, the probability of a large height difference between the pole outer protrusion and the second insulating part can be reduced. In this way, during the use or transportation of the battery cell, it is helpful to reduce the risk of a short circuit channel being formed due to accidental falling of foreign objects into the height difference between the pole outer protrusion and the second insulating part, and it can also reduce the probability of stress concentration caused by the formation of the height difference, which is helpful to improve the reliability of the battery cell.

[0045] In some embodiments of the present application, the first insulating part and the second insulating part are integrally arranged or separately arranged. In the above technical solution, the first insulating part and the second insulating part are integrally arranged, which can reduce the number of parts, reduce the assembly steps, and improve the assembly efficiency. If the first insulating part and the second insulating part are separately arranged, it is easier to control the quality of the first insulating part and the second insulating part, which can reduce the difficulty of maintenance and is conducive to controlling product quality.

[0046] In some embodiments of the present application, the first insulating portion is injection molded between the first clamping member and the pole body; and / or the second insulating portion is injection molded on an outer surface of the first clamping member away from the clamping groove.

[0047] In the above technical solution, the first insulating part is injection molded between the first clamp and the pole body, so that the first insulating part, the first clamp and the pole body can be installed more easily, which can save time and improve assembly efficiency. It is also beneficial to reduce the gap between the first insulating part, the first clamp and the pole body, reduce the risk of electrolyte leakage, and improve the bonding strength of the first insulating part, the first clamp and the pole body, thereby improving the overall connection reliability of the pole component. The second insulating part is injection molded on the outer surface of the first clamp away from the clamping groove, so that the second insulating part can be installed on the first clamp, which can save time and improve assembly efficiency. It is also beneficial to reduce the gap between the second insulating part and the first clamp, reduce the risk of electrolyte leakage, and improve the bonding strength of the second insulating part and the first clamp, thereby improving the overall connection reliability of the pole component.

[0048] In some embodiments of the present application, the first insulating part is injection molded between the first clamping piece and the pole body, and the second insulating part is injection molded on the outer surface of the first clamping piece away from the clamping groove; the first clamping piece has a through hole, and part of the second insulating part is inserted through the through hole and connected to the first insulating part.

[0049] In the above technical solution, the first insulating part and the second insulating part can be an integral part. When the first insulating part and the second insulating part are integrally injection molded, the injection liquid can form the second insulating part on the outer surface of the first clamping part away from the clamping groove, while a part of the injection liquid enters between the first clamping part and the pole body from the outside of the first clamping part, and another part of the injection liquid directly enters between the first clamping part and the pole body from the perforation, thereby forming the first insulating part. In this way, the flow rate of the injection liquid can be increased, thereby improving molding efficiency and saving time.

[0050] In some embodiments of the present application, the first clamping member and the second clamping member are integrally formed; and / or the first clamping member, the second clamping member and the first shell wall are integrally formed.

[0051] In the above technical solution, the first clamping member and the second clamping member are formed in one piece, the overall consistency of the clamping structure is good, the strength and rigidity are high, the reliability is good, and the number of parts of the pole component can be reduced, and the assembly efficiency is improved. The first clamping member, the second clamping member and the first shell wall are formed in one piece, thereby further reducing the number of parts, simplifying the assembly process, and improving the assembly efficiency. There can be no gap between the first clamping member and the second clamping member and the first shell wall, which can reduce the sealing failure path and improve the reliability of the battery cell.

[0052] In some embodiments of the present application, the clamping structure includes an inner ring segment and an outer ring segment arranged around the inner ring segment, the outer ring segment is connected to the first shell wall, a portion of the inner ring segment forms a second clamping member, and another portion is riveted to form a first clamping member.

[0053] In the above technical solution, the clamping structure is an integrally formed part, and the first clamping part and the second clamping part can be formed by riveting. Therefore, the overall consistency of the clamping structure is relatively good, and the connection gap is also small, which can enhance the connection strength between the clamping structure and the pole body and reduce the risk of loosening. In addition, the riveting and pressing method can also form a good sealing effect, further improving the sealing between the clamping structure and the pole body, which is beneficial to improving the reliability of the clamping structure, and then improving the reliability of the pole component.

[0054] In some embodiments of the present application, the length of the second clamping member in the direction from the first shell wall to the pole body is L1, and the thickness of the second clamping member is H1, satisfying the relationship:

[0055] y=-(P·L1 4 ) / 8E(b·H1 3 / 12);

[0056] Wherein, y is the disturbance of the second clamping member, which should be less than 25% of the compression of the insulating sealing structure, in mm;

[0057] P is the maximum rebound force of the insulating sealing structure after compression, in N;

[0058] E is the elastic modulus of the second clamping member, in GPa;

[0059] b is the circumference of the second clamping piece in the circumferential direction of the pole body, in mm.

[0060] In the above technical solution, by adopting the above formula, a more suitable thickness and length of the second clamping member can be calculated, so that the second clamping member has higher strength and rigidity, which can reduce the probability of the second clamping member being greatly deformed when the pole body is subjected to force, and can also reduce the probability of the pole body escaping from the second clamping member. This can improve the reliability of the insulating sealing structure between the clamping structure and the pole body, reduce the risk of insulation and sealing failure, and improve the reliability of the battery cell.

[0061] In some embodiments of the present application, the first clamping member includes a plurality of riveted portions spaced apart in a direction surrounding the pole body, and discontinuous notches are formed between adjacent riveted portions. In this technical solution, the first clamping member fixes the pole body by riveting. Since the first clamping member surrounds the pole body, discontinuous notches are formed between adjacent riveted portions, which can improve the problem of piled materials or bulges at the corners when the riveted portions are formed by riveting, resulting in bulges on the first clamping member, which is beneficial to improving the regularity of the clamping structure and is beneficial to injection molding and encapsulation.

[0062] In some embodiments of the present application, the contour of the pole body is a runway shape, which is composed of a rectangle and two semicircles located at both ends of the length of the rectangle. The riveted portion includes a first riveted portion located at both ends of the length of the pole body, and a second riveted portion located at both ends of the width of the pole body. The intermittent notch is formed between the first riveted portion and the second riveted portion, and is arranged opposite to the connection position of the rectangle and the semicircle.

[0063] In the above technical solution, the number of the first riveted parts and the second riveted parts formed by the above structure is small, and the strength and rigidity are relatively high, which is beneficial to improve the clamping strength of the first clamping member on the pole body, improve the installation reliability of the clamping structure and the pole body, and improve the stacking or bulging effect of the first clamping member during the riveting forming process, which can improve the regularity of the outer contour of the first clamping member, thereby improving the overall reliability of the battery cell.

[0064] In some embodiments of the present application, the first clamping member is arranged on the side of the second clamping member away from the electrode component, and is provided with a discontinuous notch connected to the clamping groove. In the above technical solution, the first clamping member can be arranged on the outer side of the first shell wall, and the first clamping member is provided with a discontinuous notch connected to the clamping groove. In this way, the first clamping member can be divided into multiple parts, which can reduce the molding difficulty of the first clamping member and thus improve the manufacturability. The provision of the discontinuous notch can also reduce the weight of the first clamping member, which is conducive to improving the energy density of the battery cell.

[0065] In some embodiments of the present application, there are multiple discontinuous notches and they are spaced along the direction in which the clamping structure surrounds the pole body. In this technical solution, multiple discontinuous notches are conducive to reducing the difficulty of forming the clamping structure during the manufacturing process, which can improve the manufacturability of the clamping structure, improve the product yield, and thus improve the product qualification rate of the battery cell. Multiple discontinuous notches can also greatly reduce the weight of the clamping structure, save materials, reduce costs, and also improve the energy density of the battery cell.

[0066] In some embodiments of the present application, the insulating sealing structure includes an insulating member, the insulating member includes a first insulating part and a second insulating part, the first insulating part is injection molded between the first clamping member and the pole body, the second insulating part is injection molded on the outer surface of the clamping groove formed by the first clamping member, and is partially connected to the first insulating part through an intermittent notch.

[0067] In the above technical solution, during the process of injection molding the second insulating part on the outer surface of the clamping groove formed by the first clamping part, the injection liquid can enter the gap between the first clamping part and the pole body through the discontinuous notch to form the first insulating part. As a result, the first insulating part and the second insulating part can be injection molded at one time, which simplifies the assembly process of the pole component. Moreover, the discontinuous notch is a notch formed on the first clamping part. Compared with the simple hole opening method, the opening size of the discontinuous notch is larger, which can increase the circulation rate of the injection liquid, thereby improving the molding efficiency of the first insulating part and the second insulating part, and improving the overall assembly efficiency of the pole component.

[0068] In some embodiments of the present application, the pole body includes a first metal part and a second metal part of different materials, the first metal part is located on the side of the second metal part away from the electrode component, the second metal part is connected to the electrode component, and the periphery of the first metal part and the periphery of the second metal part adjacent to the first metal part are both covered with a protective metal layer.

[0069] In the above technical solution, by configuring the pole body to include a first metal part and a second metal part made of different materials, a metal of a suitable material can be selected as needed to make the pole body. For example, the first metal part and the second metal part can be made of metal materials with different conductivities, which can reduce costs while ensuring the overall conductivity requirements. A lighter metal material can also be selected to reduce the overall weight of the pole body and improve the energy density of the battery cell. Metal materials with different weldability can also be selected as needed, which is beneficial to the welding of the pole body and other power-connecting components and improves the manufacturability of the battery cell.

[0070] In some embodiments of the present application, the pole body is a metal piece made of the same material at all locations. In this technical solution, the pole body adopting this structure is relatively simple to manufacture, which can reduce the manufacturing cost.

[0071] In some embodiments of the present application, the pole component defines a receiving groove that is recessed in a direction away from the electrode component, and the pole body defines a groove end wall on a side of the receiving groove away from the electrode component. The electrode component includes an active material coating portion and a conductive portion, and at least a portion of the conductive portion is received in the receiving groove and connected to the groove end wall.

[0072] In the above technical solution, since the conductive part of the electrode component needs to occupy a certain space, a receiving groove is defined by the pole component, and at least part of the conductive part is received in the receiving groove and connected to the groove end wall. Thus, the pole component can provide a receiving space for the conductive part, saving space in the shell component, which is conducive to arranging a larger active material coating part in the shell component, and the receiving groove is also conducive to reducing the weight of the pole component, thereby improving the energy density of the battery cell.

[0073] In some embodiments of the present application, the pole body further includes an insulating structure, which is disposed on a side of the clamping structure close to the electrode component, and the insulating structure and the insulating sealing structure jointly define a peripheral wall of the accommodating groove.

[0074] In the above technical solution, the insulating structure and the insulating sealing structure jointly define the groove wall of the receiving groove, so that a deeper receiving groove can be formed, providing a larger space to accommodate the conductive part, and further saving the space inside the shell component. Since the insulating structure and the insulating sealing structure both have an insulating function, the above structure can also insulate the conductive part from the pole body, which is conducive to reducing the risk of short circuit and improving the reliability of the battery cell.

[0075] In some embodiments of the present application, the pole body also includes an insulating structure, which is arranged on the side of the clamping structure close to the electrode component. The pole body includes an inner protrusion of the pole located in the inner ring area of ​​the insulating structure. The inner protrusion of the pole protrudes toward the inner side of the first shell wall relative to the clamping structure. A side surface of the inner protrusion of the pole close to the electrode component is flush with a side surface of the insulating structure close to the electrode component, or is located on the side of the side surface of the insulating structure close to the electrode component away from the electrode component.

[0076] In the above technical solution, by forming an inner convex portion of the pole on the pole body, the bonding area between the pole body and the clamping structure can be made larger, the connection reliability can be improved, and it is beneficial to improve the stability and reliability of the overall structure of the pole component. By making the inner convex portion of the pole flush with the surface of the side of the insulating structure close to the electrode component, the surrounding obstruction of the inner convex portion of the pole can be relatively small, and the inner convex portion of the pole can be more easily connected to the electrode component, which can reduce the difficulty of assembly, improve assembly efficiency, and also help to improve product yield. By locating the inner convex portion of the pole on the side of the surface of the side of the insulating structure close to the electrode component away from the electrode component, the insulating structure and the inner convex portion of the pole can form a certain space for accommodating the electrode component, thereby saving the internal space of the shell component and improving the energy density of the battery cell.

[0077] In some embodiments of the present application, the battery cell further includes a pressure relief device, which is disposed on the shell component and is located on the same side or on the opposite side as the pole component.

[0078] In the above technical solution, by arranging a pressure relief device in the shell component, the gas can be vented and pressure relieved in time when the internal air pressure of the shell component is high, reducing the risk of thermal runaway of the battery cell, which is conducive to improving the reliability of the battery cell. The pressure relief device and the pole component are located on the same side or on different sides, which can provide more possibilities for the arrangement of the pressure relief device, which is conducive to flexible design and reduced manufacturing costs.

[0079] In a second aspect, an embodiment of the present application provides a battery device, comprising a battery cell as described in any one of the foregoing items.

[0080] In the above technical solution, since the battery cell has a higher reliability, the reliability of the battery device using the battery cell can be improved, so that the battery device can have a better performance.

[0081] In some embodiments of the present application, the battery device includes a box body, a plurality of battery cells are accommodated in the box body, the bottom of the box body is the box body bottom plate, and the pole component is arranged on a side of the shell component close to the box body bottom plate, or on a side of the shell component away from the box body bottom plate.

[0082] In the above technical solution, the pole component of the battery cell is arranged on the side of the shell component close to the bottom plate of the box body, which is conducive to lowering the center of gravity of the battery device as a whole, and is conducive to the heat dissipation of the battery cell and the battery device, which can improve the reliability of the battery device. The pole component is arranged on the side of the shell component away from the bottom plate of the box body, which is conducive to the electrical connection inside the battery device, and is also convenient for maintenance and repair, and can also improve the waterproof and dustproof performance of the battery device, and can reduce the probability of damage to the battery cell when the bottom of the box body is hit, and can also improve the reliability of the battery device.

[0083] In a third aspect, an embodiment of the present application provides an electrical device, including the battery device mentioned above, and the battery device is used to store or provide electrical energy.

[0084] In the above technical solution, since the battery cell or battery device has a higher reliability, the reliability of the electrical device using the battery cell or battery device can be improved, and the electrical device can have a better performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0085] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0086] Figure 1A schematic diagram of a structure in which the electric device provided in some embodiments of the present application is a vehicle;

[0087] Figure 2 An exploded view of the structure of a battery device provided in some embodiments of the present application;

[0088] Figure 3 A schematic diagram of the internal structure of a battery cell provided in some embodiments of the present application;

[0089] Figure 4 A schematic diagram of the structure of a pole component provided in some embodiments of the present application;

[0090] Figure 5 A schematic diagram of a partial structure of a clamping structure provided in some embodiments of the present application;

[0091] Figure 6 A schematic diagram of the structure of a pole component provided in another embodiment of the present application;

[0092] Figure 7 A schematic diagram of a partial structure of a clamping structure provided in another embodiment of the present application;

[0093] Figure 8 A schematic structural diagram of a pole component provided in yet another embodiment of the present application;

[0094] Fig. 9 A schematic diagram of a partial structure of a clamping structure provided in yet another embodiment of the present application;

[0095] Fig.10 A schematic diagram of a three-dimensional structure of a battery cell provided in some embodiments of the present application;

[0096] Fig.11 Schematic diagram of the internal structure of a battery cell provided in some other embodiments of the present application Figure 1 ;

[0097] Fig.12 Schematic diagram of the internal structure of a battery cell provided in some other embodiments of the present application Figure 2 ;

[0098] Fig.13 Schematic diagram of the internal structure of a battery cell provided in some other embodiments of the present application Figure 3 ;

[0099] Fig.14 Schematic diagram of the internal structure of a battery cell provided in some other embodiments of the present application Figure 4 ;

[0100] Fig.15 A schematic diagram of the structure of a pole body provided in some embodiments of the present application;

[0101] Fig.16 A schematic diagram of the structure of a pole body provided in another embodiment of the present application;

[0102] Fig.17 A schematic diagram of the structure of a pole body provided in yet another embodiment of the present application;

[0103] Fig.18 A schematic diagram of a partial structure of a pole component provided in some embodiments of the present application;

[0104] Fig.19 A schematic diagram of a partial structure of a pole component provided in another embodiment of the present application;

[0105] Fig. 20 An exploded view of a pole component before assembly provided in some embodiments of the present application;

[0106] Fig.21 A schematic diagram of a three-dimensional structure assembly of a pole body and a clamping structure provided in some embodiments of the present application;

[0107] Fig. 22 A schematic diagram of a three-dimensional structure of a clamping structure provided in some embodiments of the present application;

[0108] Fig.23 Schematic diagram of the internal structure of a battery cell provided in some other embodiments of the present application Figure 5 ;

[0109] Fig.24 Schematic diagram of the assembly of battery cells provided in some embodiments of the present application Figure 1 ;

[0110] Fig.25 Schematic diagram of the assembly of battery cells provided in some embodiments of the present application Figure 2 .

[0111] icon:

[0112] 1000. Electrical devices;

[0113] 100. Battery device;

[0114] 10. Box body; 11. First box body; 12. Second box body;

[0115] 20. Battery cells;

[0116] 21. Shell parts;

[0117] 201, first shell wall; 201a, mounting hole; 211, shell; 212, cover;

[0118] 22. Electrode parts;

[0119] 221, active material coating portion; 222, conductive portion;

[0120] 23. Pole components;

[0121] 231. Pole body;

[0122] 2311, main body;

[0123] 2312, edge portion; 2312a, first recessed portion; 2312b, second recessed portion;

[0124] 2313, outer convex part of the pole; 23101, surface; 23131, central area; 23132, peripheral area;

[0125] 2314. The inner convex part of the pole;

[0126] 232. Clamping structure;

[0127] 2321, first clamping member; 2301, first arm; 2302, second arm; 2303, third arm; 2321a, outer surface; 2321b, perforation; 301, riveted portion; 3011, first riveted portion; 3012, second riveted portion; 302, intermittent notch; 303, rectangle; 304, semicircle; 305, first metal portion; 306, second metal portion; 307, protective metal layer;

[0128] 2322, second clamping member; 2304, fourth arm portion; 2305, fifth arm portion;

[0129] 2323, clamping groove; 2323a, notch;

[0130] 2324, inner ring segment; 2325, outer ring segment;

[0131] 233. Insulation sealing structure;

[0132] 2331, first sealing member; 2306, first portion; 2307, second portion;

[0133] 2332, second sealing member;

[0134] 2333, insulating member; 2308, first insulating portion; 2309, second insulating portion;

[0135] 234. Insulation structure;

[0136] 235, receiving groove; 2351, groove end wall; 2352, groove peripheral wall;

[0137] 236, compression arm; 237, clearance;

[0138] 24. Pressure relief device;

[0139] 200, controller; 300, motor; X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0140] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0141] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0142] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0143] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0144] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0145] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0146] The term “plurality” used in this application refers to two or more (including two).

[0147] In the present application, battery cells may include lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc., which are not limited in the embodiments of the present application. Battery cells may be cylindrical, flat, rectangular or other shapes, which are not limited in the embodiments of the present application. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, which are not limited in the embodiments of the present application.

[0148] The battery apparatus (Battery Apparatus) mentioned in the embodiments of the present application may refer to one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly (Battery Cell Assembly) may include multiple battery cells, and the multiple battery cells are connected in series, in parallel, or in mixed connection through a bus. In some embodiments, the battery cell assembly (Battery Cell Assembly) is generally formed by arranging multiple battery cells.

[0149] As an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0150] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the housing. As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the housing by fixing the battery module in the housing. As an example, the battery cell assembly may also be accommodated in the housing by directly fixing a plurality of battery cells to the housing. The housing may prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0151] The battery cell includes a shell, an electrode component and an electrolyte, and the shell is used to contain the electrode component and the electrolyte. The electrode component is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer. The positive electrode collector not coated with the positive electrode active material layer serves as a positive electrode ear. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The negative electrode current collector not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer. The negative electrode current collector not coated with the negative electrode active material layer serves as a negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon, etc. In order to ensure that a large current passes without melting, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together.

[0152] The material of the isolation film may be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode component may be a winding structure or a laminated structure, but the embodiments of the present application are not limited thereto.

[0153] A battery device generally consists of a box and multiple battery cells contained in the box. As the core component of the battery device, the battery cell has high requirements in terms of safety and service life. To ensure the stability of the battery cell, the outer shell of the battery cell and the external environment need to have a high degree of sealing. Therefore, how to further improve the sealing of the battery cell and the external environment has become one of the problems that need to be solved.

[0154] In a general battery cell, a pole is provided on the outer shell, and the pole passes through the outer shell and is electrically connected to the electrode component inside the outer shell. In order to ensure the sealing between the outer shell and the external environment, the pole needs to be sealed with the outer shell through a seal. However, in a general battery cell, the seal between the pole and the outer shell is prone to the risk of sealing failure. There are mainly two reasons. First, the compression amount of the seal between the pole and the outer shell is insufficient and cannot fully play a sealing role. Second, the battery cell needs to be connected to other electrical components or battery cells, and the pole is more susceptible to the force. For example, the pole is more commonly subjected to a pulling force away from the pole. When the pulling force is large, it is easy to cause damage and deformation of the pole or the outer shell, thereby causing sealing failure of the seal, affecting the reliability of the battery cell.

[0155] Based on the above considerations, in order to solve the problem that the sealing failure between the pole and the shell is easy to occur, which affects the sealing of the shell of the battery cell and the external environment, and thus affects the reliability of the battery cell. The applicant has designed a battery cell, including: a shell component, an electrode component and a pole component, the electrode component is arranged in the shell component, the shell component includes a first shell wall, the pole component is arranged in the first shell wall and includes: a pole body connected to the electrode component; a clamping structure surrounding the pole body and connected to the first shell wall; an insulating sealing structure, insulated and sealed between the clamping structure and the pole body; wherein the clamping structure includes a first clamping member and a second clamping member connected and arranged, at least one of the first clamping member and the second clamping member is bent toward the other to form a clamping groove together; the clamping groove clamps the pole body, the clamping groove is formed with a notch, and the clamping groove is tightened at the notch to prevent the pole body from escaping from the notch; wherein, along the thickness direction of the first shell wall, the ratio of the minimum size of the notch to the maximum size of the clamping groove is less than 90%.

[0156] In a battery cell of this structure, the pole component of the above structure is adopted, and the pole body can be clamped and fixed by the insulating sealing structure and the clamping structure, and then connected to the first shell wall of the shell component by the clamping structure, thereby reducing the risk of contact between the pole body and the shell component during the assembly process of the battery cell, reducing the probability of damage to the pole body, and being conducive to ensuring the integrity of the pole body, improving the current carrying reliability, and thus improving the reliability of the battery cell. With the clamping structure of the above scheme, the clamping groove formed by the first clamping member and the second clamping member can clamp the insulating sealing structure and the pole body more tightly, thereby improving the installation reliability of the insulating sealing structure and the pole body, which is conducive to improving the overall stability of the pole component, and can also increase the compression of the insulating sealing structure, improve the insulation and sealing between the clamping structure and the pole body, thereby improving the reliability of the pole component, and thus also improving the reliability of the battery cell.

[0157] The battery cells and battery devices disclosed in the embodiments of the present application may be used, but not limited to, in electrical devices such as vehicles, ships or aircraft, and may also be applied to a power supply system that uses the battery cells and battery devices disclosed in the present application to form the electrical devices.

[0158] The embodiment of the present application provides an electric device using a battery device as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0159] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electric device 1000 of an embodiment of the present application. Figure 1 , Figure 1 The power device 1000 provided for some embodiments of the present application is a schematic diagram of the structure of a vehicle. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle, and the battery device 100 can be provided at the bottom, head or tail of the vehicle. The battery device 100 can be used to power the vehicle, for example, the battery device 100 can be used as an operating power source for the vehicle. The vehicle may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to power the motor 300, for example, for starting, navigating and driving the vehicle. Working power requirements.

[0160] In some embodiments of the present application, the battery device 100 can be used not only as an operating power source for the vehicle, but also as a driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0161] Please refer to Figure 2 , Figure 2 The structural exploded diagram of the battery device 100 provided in some embodiments of the present application. The battery device 100 includes a box body 10 and a plurality of battery cells 20, and the battery cells 20 are used to be accommodated in the box body 10. Among them, the box body 10 is used to provide an assembly space for the battery cells 20, and the box body 10 can adopt a variety of structures. In some embodiments, the box body 10 may include a first box body 11 and a second box body 12, and the first box body 11 and the second box body 12 cover each other, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery cells 20. The second box body 12 can be a hollow structure with one end open, and the first box body 11 can be a plate-like structure. The first box body 11 covers the open side of the second box body 12, so that the first box body 11 and the second box body 12 jointly define the assembly space; the first box body 11 and the second box body 12 can also be hollow structures with one side open, and the open side of the first box body 11 covers the open side of the second box body 12. Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cylinder, a cuboid, etc.

[0162] In the battery device 100, multiple battery cells 20 can be connected in series, in parallel, or in a mixed connection. A mixed connection means that multiple battery cells 20 are connected in series and in parallel. Multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by multiple battery cells 20 is accommodated in the box 10; of course, the battery device 100 can also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 10. The battery device 100 may also include other structures, for example, the battery device 100 may also include a busbar for realizing electrical connection between multiple battery cells 20.

[0163] Please refer to Figure 2 , Figure 2 The structure of the battery device 100 provided in some embodiments of the present application is exploded. The battery device 100 includes multiple rows of battery cells 20, which are arranged along the length direction of the box body 10, and each row of battery cells 20 includes multiple battery cells 20 arranged along the width direction of the box body 10; or, multiple rows of battery cells 20 are arranged along the width direction of the box body 10, and each row of battery cells 20 includes multiple battery cells 20 arranged along the length direction of the box body 10.

[0164] Each battery cell 20 may be a secondary battery or a primary battery, wherein a secondary battery refers to a battery cell 20 that can be continuously used by activating the active material by charging after the battery cell is discharged; it may also be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc., which is not limited in the embodiments of the present application. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes. For example, in Figure 2 In the figure, the battery cell 20 is in the shape of a rectangular parallelepiped.

[0165] According to some embodiments of the present application, referring to Figure 3 , Figure 4 , Figure 6 , Figure 8 , Figure 12 to Figure 14The embodiment of the present application provides a battery cell 20, including a shell component 21, an electrode component 22 and a pole component 23. The electrode component 22 is arranged in the shell component 21, and the shell component 21 includes a first shell wall 201. The pole component 23 is arranged in the first shell wall 201 and includes: a pole body 231, a clamping structure 232 and an insulating sealing structure 233. The pole body 231 is connected to the electrode component 22; the clamping structure 232 surrounds the pole body 231 and is connected to the first shell wall 201; the insulating sealing structure 233 is insulated and sealed between the clamping structure 232 and the pole body 231. The clamping structure 232 includes a first clamping member 2321 and a second clamping member 2322 which are connected to each other, and at least one of the first clamping member 2321 and the second clamping member 2322 is bent toward the other to form a clamping groove 2323 together; the clamping groove 2323 clamps the pole body 231, and the clamping groove 2323 is formed with a notch 2323a, and the clamping groove 2323 is tightened at the notch 2323a to prevent the pole body 231 from escaping from the notch 2323a; wherein, along the thickness direction of the first shell wall 201, the ratio of the minimum size of the notch 2323a to the maximum size of the clamping groove 2323 is less than 90%.

[0166] The shell component 21 may refer to a component that contains the electrode component 22 and the electrolyte and protects the electrode component 22 and the electrolyte inside. The shell component 21 may be made of, but not limited to, metal or plastic. The metal material may be, but not limited to, steel or aluminum, etc. The plastic material may be, but not limited to, polycarbonate, polypropylene, etc. The shell component 21 may be, but not limited to, a cylinder, a cuboid, a flat body, or other shapes.

[0167] The first shell wall 201 may refer to one of the multiple shell walls of the shell component 21. Exemplarily, the shell component 21 may include a peripheral wall and a top wall and a bottom wall connected at both ends of the peripheral wall, and the first shell wall 201 may be a peripheral wall, a top wall or a bottom wall, etc. Referring to the foregoing, the peripheral wall may be circular, square or other shapes, etc. For example, when the shell component 21 is in a cylindrical shape, the peripheral wall is circular; when the shell component 21 is in a rectangular parallelepiped shape, the peripheral wall may include multiple side walls, and the first shell wall 201 may be one or more of the multiple side walls.

[0168] The explanation of the electrode component 22 can be found in the previous text and will not be repeated here.

[0169] There can be one or more pole parts 23, one part can be used as positive pole, and the other part can be used as negative pole. There can be one or more pole parts 23 used as positive pole, and one or more pole parts 23 used as negative pole.

[0170] The pole body 231 may refer to a key component in the pole component 23 that conducts current. The shape of the pole body 231 may be, but is not limited to, a cylindrical shape, a square column shape, or a racetrack shape, etc. The material of the pole body 231 may be, but is not limited to, aluminum, copper, or a copper-aluminum composite material, etc., and the pole body 231 may be made of one or more materials. For example, the pole body 231 is an aluminum material part or a copper material part as a whole.

[0171] The clamping structure 232 may refer to a component connected to the housing component 21 and capable of fixing the pole body 231. The clamping structure 232 can prevent the pole body 231 from directly contacting the housing component 21. The clamping structure 232 may include at least a first clamping member 2321 and a second clamping member 2322 that are connected and arranged, wherein the first clamping member 2321 and the second clamping member 2322 may be understood as two clamping arms arranged opposite to each other.

[0172] Reference Figure 5 and Figure 7 , the first clamping member 2321 can be bent toward the direction close to the second clamping member 2322, and the second clamping member 2322 is a straight clamping arm; or, the second clamping member 2322 is bent toward the direction close to the first clamping member 2321, and the first clamping member 2321 is a straight clamping arm; or, referring to Fig. 9 The first clamping member 2321 and the second clamping member 2322 are both bent clamping arms, and are bent toward each other.

[0173] The material of the clamping structure 232 may be, but is not limited to, metal or plastic. The metal material may be, but is not limited to, steel or aluminum, etc. The plastic material may be, but is not limited to, polycarbonate, polypropylene, etc.

[0174] The clamping groove 2323 may refer to a groove structure defined between the first clamping piece 2321 and the second clamping piece 2322 , and the notch 2323 a may refer to an open portion of the clamping groove 2323 .

[0175] “The clamping groove 2323 is tightened at the notch 2323a” can be understood as that one of the first clamping member 2321 and the second clamping member 2322 that is bent can be an inclined straight clamping arm or an arc-shaped clamping arm. Taking the example that both the first clamping member 2321 and the second clamping member 2322 are bent, the clamping groove 2323 formed by the first clamping member 2321 and the second clamping member 2322 can be a C-shaped groove, a tapered groove, etc., which is not specifically limited here.

[0176] The insulating sealing structure 233 may refer to a component having insulating and sealing functions, and may be, but not limited to, a plastic material component, a rubber material component, etc. Exemplarily, the insulating sealing structure 233 may be a plastic structure.

[0177] Since the pole component 23 includes a pole body 231, a clamping structure 232 and an insulating sealing structure 233, in the pole component 23 of this structure, the pole body 231 serves as an important structural member for transmitting the electrode component 22 and external power connection components (bus, bar or wire, etc.). The pole body 231 can be pre-installed on the clamping structure 232 through the insulating sealing structure 233, and then the clamping structure 232 is connected to the first shell wall 201. This can protect the pole body 231, reduce the risk of damage caused by direct contact between the pole body 231 and the first shell wall 201, improve the integrity of the pole body 231, and thus ensure the performance of the pole body 231.

[0178] In the clamping structure 232 of the above scheme, the first clamping member 2321 and the second clamping member 2322 can form a clamping groove 2323, and the clamping groove 2323 clamps the pole body 231 through the insulating sealing structure 233. In this way, the clamping structure 232 can provide a relatively reliable clamping force to the pole body 231, thereby improving the installation reliability of the pole body 231. Since the clamping groove 2323 is tightened at the notch 2323a, the tightening position of the notch 2323a has a relatively small action surface on the pole body 231, and the "tightening position" can provide a greater clamping force to the pole body 231. In this way, the position of the insulating sealing structure 233 corresponding to the "tightening position" has a greater compression amount, which is conducive to improving the insulation and sealing between the pole body 231 and the clamping structure 232.

[0179] refer to Figure 3 and Figure 4 , the "thickness direction of the first shell wall 201" may be the third direction Z in the figure. For ease of understanding, refer to Figure 5 , the minimum dimension of the notch 2323a can be recorded as M1, and the maximum dimension of the clamping groove 2323 can be recorded as M2. "The ratio of the minimum dimension of the notch 2323a to the maximum dimension of the clamping groove 2323 is less than 90%", which can be understood as M1 / M2 is less than 0.9. Among them, M1 / M2 can be but not limited to 0.9, 0.8, 0.7, 0.6, 0.5, etc.

[0180] It is understandable that the clamping groove 2323 needs to set a minimum size at the tightening position of the notch 2323a. If the tightening amplitude of the notch 2323a is small, it is not conducive to the clamping structure 232 to provide a greater clamping force to the insulating sealing structure 233 and the pole body 231, affecting the insulation and sealing of the insulating sealing structure 233, as well as the clamping reliability of the pole body 231. Therefore, by setting the minimum size of the notch 2323a and the maximum size of the clamping groove 2323 within the above range, on the one hand, the clamping structure 232 can provide a greater clamping force to the pole body 231, so that the pole body 231 has a higher installation reliability, and on the other hand, the clamping structure 232 can make the insulating sealing structure 233 have a greater compression amount, so that the pole body 231 and the clamping structure 232 have a better insulation and sealing effect.

[0181] In the above technical solution, the pole component 23 of the above structure is adopted, and the pole body 231 can be clamped and fixed by the insulating sealing structure 233 and the clamping structure 232, and then connected to the first shell wall 201 of the shell component 21 through the clamping structure 232. In this way, during the assembly process of the battery cell 20, the risk of contact between the pole body 231 and the shell component 21 can be reduced, and the probability of damage to the pole body 231 can be reduced, which is beneficial to ensuring the integrity of the pole body 231, improving the reliability of the pole body 231 overcurrent, and then improving the reliability of the battery cell 20. The clamping groove 2323 formed by the first clamping member 2321 and the second clamping member 2322 can clamp the insulating sealing structure 233 and the pole body 231 more firmly, and the clamping structure 232 is not easily stretched open, thereby improving the installation reliability of the insulating sealing structure 233 and the pole body 231, which is beneficial to improving the overall stability of the pole component 23, and can also increase the compression amount of the insulating sealing structure 233, improve the insulation and sealing between the clamping structure 232 and the pole body 231, thereby improving the reliability of the pole component 23, and then the reliability of the battery cell 20 can also be improved.

[0182] In some embodiments of the present application, reference Figure 5 , Figure 7 and Fig. 9 The first clamping member 2321 includes a first arm portion 2301, a second arm portion 2302 and a third arm portion 2303 which are bent and connected in sequence, the first arm portion 2301 is connected to the second clamping member 2322 and extends in a direction away from the second clamping member 2322, and at least one of the second arm portion 2302 and the third arm portion 2303 is extended and arranged gradually approaching the second clamping member 2322; the first arm portion 2301, the second arm portion 2302 and the third arm portion 2303 and the second clamping member 2322 jointly form a clamping groove 2323, and the end of the third arm portion 2303 away from the second arm portion 2302 and the end of the second clamping member 2322 away from the first arm portion 2301 jointly form a notch 2323a.

[0183] The first clamping member 2321 can be further away from the first shell wall 201 than the second clamping member 2322. The first clamping member 2321 can be divided into three parts, including a first arm 2301, a second arm 2302 and a third arm 2303. Figure 5 , Figure 7 and Fig. 9 For ease of understanding, two auxiliary dotted lines are drawn on the first clamping member 2321 in the figure for demarcation.

[0184] Reference Figure 5 , both the second arm portion 2302 and the third arm portion 2303 can be extended and arranged gradually approaching the second clamping member 2322. For example, referring to Figure 7 and Fig. 9 , the third arm portion 2303 may be arranged to extend gradually close to the second clamping member 2322. Exemplarily, the second arm portion 2302 may also be arranged to extend gradually close to the second clamping member 2322.

[0185] In the above technical solution, since the first arm 2301, the second arm 2302 and the third arm 2303 are bent and connected in sequence, the first clamping piece 2321 can form a clamping groove 2323 that is wide inside and narrow outside. The inner space of the clamping groove 2323 is relatively ample, and the pole body 231 can be closer to the inner side of the clamping groove 2323. As a result, the size of the part where the pole body 231 and the clamping groove 2323 are combined is larger, which can improve the installation reliability of the pole body 231.

[0186] Since the inner space of the clamping groove 2323 defined by the first arm 2301, the second arm 2302 and the third arm 2303 is relatively large, the pole body 231 can be closer to the first arm 2301 when embedded in the inner side of the clamping groove 2323, that is, the dimensions of the pole body 231 and the first arm 2301 in the first direction X can be relatively small. In other words, the above structure can also make the arrangement between the pole body 231 and the clamping groove 2323 more compact, reduce the volume of the pole component 23, and help improve the volume energy density of the battery cell 20.

[0187] In some embodiments of the present application, reference Figure 5 , Figure 7 and Fig. 9 The second arm portion 2302 is arranged parallel to the first shell wall 201, and the second arm portion 2302 is bent and connected to the first arm portion 2301 and the third arm portion 2303; or, the second arm portion 2302 is an arc-shaped arm, which is bent and connected to the first arm portion 2301 and the third arm portion 2303.

[0188] For example, reference Figure 7 and Fig. 9The second arm portion 2302 is arranged parallel to the first shell wall 201 , and the second arm portion 2302 can be bent and connected to both the first arm portion 2301 and the third arm portion 2303 .

[0189] For example, reference Figure 5 The second arm portion 2302 is arranged parallel to the first shell wall 201, and the second arm portion 2302 may be an arc-shaped arm, and is bent to connect the first arm portion 2301 and the third arm portion 2303. In this embodiment, the arc-shaped arm can make the transition between the first arm portion 2301 and the third arm portion 2303 smoother and more rounded, reduce the risk of stress concentration, and improve the reliability of the first clamping member 2321.

[0190] During the use of the battery cell 20, the pole body 231 has a certain probability of being pulled by the busbar, wire or other electrical components. For example, when the battery device 100 or the electrical device 1000 used by the battery cell 20 is displaced, the battery cell 20 will shake up and down, and the pole body 231 is easily affected by the force of the components connected to it; or, when there is a lot of reaction gas inside the battery cell 20, causing the air pressure inside the shell component 21 to exceed the preset pressure value, the internal air pressure will exert an outward ejection force on the pole body 231.

[0191] When the above situation occurs, the pole body 231 is subjected to a force directed from the electrode component 22 to the first shell wall 201, which will cause the pole body 231 to be at risk of being separated from the clamping structure 232. In the above technical solution, whether the second arm 2302 is bent and connected to the first arm 2301 and the third arm 2303, or the second arm 2302 is an arc-shaped arm, which is bent and connected to the first arm 2301 and the third arm 2303, the bending direction of the bending structure of the first clamp 2321 is opposite to the force direction of the pole body 231. When the pole body 231 is subjected to a force in a direction away from the first shell wall 201, the first clamp 2321 has a better effect of resisting deformation, which can increase the difficulty of the pole body 231 being separated from the clamping structure 232 and reduce the probability of the pole body 231 being separated from the clamping structure 232.

[0192] In the above technical solution, the first clamping member 2321 adopts the above bending structure to improve its own strength and rigidity. When the pole body 231 is subjected to the force in the direction from the electrode component 22 to the first shell wall 201, the first clamping member 2321 has a better effect of resisting deformation, which can reduce the probability of the pole body 231 being separated from the clamping structure 232 due to large deformation, which is conducive to improving the overall reliability of the pole component 23. In addition, the above structure can provide more implementation schemes of the first clamping member 2321, which can increase design flexibility and help meet different product requirements.

[0193] In some embodiments of the present application, reference Figure 5 , Figure 7 and Fig. 9 , the third arm portion 2303 is arranged at an angle relative to the first arm portion 2301 and the first shell wall 201; or, the third arm portion 2303 is arranged parallel to the first arm portion 2301, and is arranged at an angle with the first shell wall 201.

[0194] For example, reference Figure 5 and Figure 7 The third arm portion 2303 is arranged at an angle relative to the first arm portion 2301 and the first shell wall 201, wherein the second arm portion 2302 can be an arc-shaped arm or a straight arm.

[0195] For example, reference Fig. 9 The third arm portion 2303 is arranged parallel to the first arm portion 2301 , and both are arranged at an angle to the first shell wall 201 .

[0196] In the above technical solution, the third arm portion 2303 is set at an angle relative to the first arm portion 2301 and the first shell wall 201. This structure can make the bending structure of the first clamping member 2321 relatively simple, reduce the difficulty of molding, improve manufacturability, and improve product yield. In order to enable the clamping structure 232 to clamp the pole body 231, the third arm 2303 is either perpendicular to the first shell wall 201 or inclined in the direction close to the pole body 231. In this case, the third arm 2303 is arranged parallel to the first arm 2301 and both are arranged at an angle to the first shell wall 201, so that the distance between the third arm 2303 and the first arm 2301 can be relatively small, and the first arm 2301 must undergo a greater position deformation relative to the third arm 2303 to enable the pole body 231 to be separated from the clamping structure 232. This can increase the difficulty of the pole body 231 to be separated from the clamping structure 232, thereby improving the clamping reliability of the clamping structure 232 on the pole body 231, thereby improving the overall reliability of the pole body 231, and further improving the reliability of the battery cell 20.

[0197] In some embodiments of the present application, reference Figure 5 , Figure 7 and Fig. 9 The first arm portion 2301 is arranged perpendicular to the first shell wall 201 .

[0198] By setting the first arm portion 2301 perpendicular to the first shell wall 201, the distance between the pole body 231 and the first arm portion 2301 can be relatively small, and the position arrangement between the clamping structure 232 and the pole body 231 is more compact, which is beneficial to reducing the overall size of the pole component 23 and improving the volume energy density of the battery cell 20.

[0199] When the clamping structure 232 clamps and fixes the pole body 231, the first arm 2301 and the second arm 2302 are used to press part of the insulating sealing structure 233 onto the pole body 231. For ease of understanding, the part of the insulating sealing structure 233 between the edge portion 2312 and the second clamping member 2322 can be referred to as the first sealing member 2331. Since the first arm 2301 is perpendicular to the first shell wall 201, the compression force arm 236 formed by the clamping structure 232 on the first sealing member 2331 is relatively short (see FIG. Figure 4 ), the compression arm 236 may refer to Figure 4 The connecting line between the two points in the middle can increase the torque of the second arm 2302 and the third arm 2303 on the first seal 2331, which is beneficial to increase the compression amount of the first seal 2331 and improve the sealing reliability of the first seal 2331.

[0200] For ease of understanding, further examples can be given to illustrate that the first clamping member 2321 can be installed on the pole body 231 through the insulating sealing structure 233 by riveting, thereby forming the first arm 2301, the second arm 2302 and the third arm 2303. When the riveting force is removed, since the compression force arm 236 formed by the clamping structure 232 on the first seal 2331 is relatively short, the reaction force arm of the first seal 2331 rebounding on the second arm 2302 and the third arm 2303 is also relatively short, so that the first seal 2331 can be kept at a relatively large compression amount, which is conducive to improving the problem of compression attenuation of the first seal 2331, so that the compression amount of the first seal 2331 can be kept at the expected set value, thereby improving the sealing reliability of the first seal 2331 between the edge portion 2312 and the second clamping member 2322, that is, improving the insulation and sealing properties of the insulating sealing structure 233.

[0201] In addition, refer to Figure 5 , Figure 7 , Fig. 9 and Fig.10Since the first arm 2301 is arranged perpendicular to the first shell wall 201, the structure formed by the first clamping member 2321, the second clamping member 2322 and the pole body 231 is more compact, which is conducive to reducing the size of the clamping structure 232 in the first direction X and the second direction Y, making the overall structure of the pole component 23 more compact. Since the size of the clamping structure 232 in the second direction Y is more compact, when the size of the first shell wall 201 in the second direction Y is the same, the size of the pole body 231 in the pole component 23 of the present application in the second direction Y can be made larger, which is conducive to increasing the area of ​​the surface 23101 of the pole body 231 away from the pole component 23. When the pole body 231 is connected to the busbar or other electrical connection components through the surface 23101, the surface 23101 and the busbar, the bar or other electrical connection components can have a larger connection surface (such as a welding surface), so that the pole body 231 can also have a larger current flow area, which can improve the charging and discharging efficiency and is conducive to realizing a higher performance narrow battery cell design.

[0202] In the above technical solution, the structure in which the first arm 2301 is arranged perpendicular to the first shell wall 201 can reduce the compression force arm 236 of the clamping structure 232 on the insulating sealing structure 233, enhance the compression effect of the first clamping member 2321 on the insulating sealing structure 233, enhance the insulation and sealing effect, and help improve the insulation and sealing reliability of the insulating sealing structure 233, and improve the overall reliability of the battery cell 20. On the other hand, the above structure can also make the structure of the clamping structure 232 more compact, thereby making the overall structure of the pole part 23 more compact, so that the side of the pole body 231 away from the electrode part 22 can have a larger surface 23101, which is conducive to increasing the flow area of ​​the pole body 231 and improving the current carrying capacity of the pole body 231, thereby helping to improve the charging and discharging performance of the battery cell 20.

[0203] In some embodiments of the present application, reference Fig. 9 The second clamping member 2322 includes a fourth arm portion 2304 . The fourth arm portion 2304 is parallel to the first shell wall 201 and forms a clamping groove 2323 together with the first clamping member 2321 .

[0204] Reference Figure 8 The second clamping member 2322 can be closer to the inner side of the shell part 21 and the electrode part 22 relative to the first clamping member 2321. Since the fourth arm portion 2304 is parallel to the first shell wall 201, the space occupied by the fourth arm portion 2304 in the third direction Z is relatively small.

[0205] In the above technical solution, the fourth arm portion 2304 is relatively close to the inner side of the shell part 21. By making the fourth arm portion 2304 parallel to the first shell wall 201, the fourth arm portion 2304 can be arranged more compactly in the shell part 21, saving the internal space of the shell part 21. This is conducive to increasing the size of the electrode part 22 and improving the volume energy density of the battery cell 20.

[0206] In some embodiments of the present application, reference Fig. 9 The second clamping member 2322 further includes a fifth arm portion 2305 , which is bent and connected to the fourth arm portion 2304 and extends in a direction close to the first clamping member 2321 .

[0207] The second clamping member 2322 can be divided into two parts, namely the fourth arm portion 2304 and the fifth arm portion 2305, and form a bending structure similar to an L shape. Exemplarily, the fifth arm portion 2305 can be understood as a protrusion or convex bump protruding relative to the fourth arm portion 2304. A notch 2323a can be defined between the fifth arm portion 2305 and the third arm portion 2303.

[0208] In the above technical solution, since the third arm portion 2303 is bent relative to the second arm portion 2302, on this basis, the fifth arm portion 2305 is bent and connected to the fourth arm portion 2304, so that a protruding structure protruding toward each other can be formed on the first clamping member 2321 and the second clamping member 2322, which can further increase the clamping force on the pole body 231 and further improve the installation reliability of the pole body 231. By adopting the above structure, on the one hand, the squeezing pressure on the insulating sealing structure 233 can be further increased, the compression amount of the insulating sealing structure 233 can be increased, and the insulation and sealing of the insulating sealing structure 233 between the pole body 231 and the clamping structure 232 can be improved. On the other hand, the protruding structure formed by the first clamping member 2321 and the second clamping member 2322 can increase the complexity of the insulation and sealing path of the insulating sealing structure 233, which is beneficial to increase the contact surface between the insulating sealing structure 233 and the first clamping member 2321 and the second clamping member 2322, thereby enhancing the insulation and sealing of the insulating sealing structure 233 between the pole body 231 and the clamping structure 232, reducing the risk of electrolyte leakage from the pole component 23, and improving the reliability of the battery cell 20.

[0209] In some embodiments of the present application, reference Figure 3 , Figure 8 and Fig. 9, the fifth arm 2305 is perpendicular to the first shell wall 201. In the above technical solution, since the fourth arm 2304 is parallel to the first shell wall 201, on this basis, the fifth arm 2305 is perpendicular to the first shell wall 201, which can be understood as the fifth arm 2305 is perpendicular to the fourth arm 2304. In this way, the overall structure of the second clamping member 2322 is more compact, and the dimensions of the fifth arm 2305 in the first direction X and the third direction Z can be made relatively small, which is conducive to saving space and reducing the overall volume of the pole component 23. On the other hand, the fifth arm 2305 is perpendicular to the fourth arm 2304, so that the second clamping member 2322 can form a vertical structure, which can improve the overall strength and rigidity of the second clamping member 2322, enhance the fixing effect on the insulating sealing structure 233 and the pole body 231, improve the overall reliability of the pole component 23, and then improve the overall reliability of the battery cell 20.

[0210] In some embodiments of the present application, reference Figure 4 , Figure 6 , Figure 8 , 12 to Fig.14 The pole body 231 includes a main body 2311 and an edge portion 2312 connected to the main body 2311 , and the edge portion 2312 is located in the clamping groove 2323 .

[0211] The main body 2311 may refer to the main structural part of the pole body 231 , which is used to electrically connect the electrode component 22 .

[0212] The edge portion 2312 may refer to an annular portion disposed around the circumference of the main body portion 2311. Fig.15 ,exist Fig.15 In the third direction Z, the thickness of the edge portion 2312 may be smaller than the thickness of the main body portion 2311 .

[0213] In the above technical solution, the edge portion 2312 of the pole body 231 is clamped and matched with the clamping groove 2323 formed by the clamping structure 232, and the main body 2311 can be exposed outside the clamping groove 2323 and connected to other power connection components such as a bus, a wire or a bar, and the main body 2311 is easy to keep flush with the surface of the clamping structure 232 away from the first shell wall 201, or maintain a small height difference, which is conducive to making the overall shape of the pole component 23 more regular, and also makes it easier to connect the pole body 231 with other power connection components such as a bus, a wire or a bar.

[0214] In some embodiments of the present application, reference Figures 15 to 17 The edge portion 2312 is bent relative to the main body portion 2311 as a whole.

[0215] For example, refer to Fig.15 and Fig.17 The edge portion 2312 may be arranged to be bent relative to the main body portion 2311 by having an uneven thickness. Fig.16 The edge portion 2312 can also be bent relative to the main body 2311 as a whole by partially bending. The edge portion 2312 can also be bent relative to the main body 2311 as a whole.

[0216] In the above technical solution, the edge portion 2312 is bent relative to the main body 2311, so that the overall strength and rigidity of the edge portion 2312 can be improved, which is beneficial to improving the strength and rigidity of the structure formed by the edge portion 2312 and the clamping structure 232, and can improve the reliability of the overall structure of the pole component 23. Since the edge portion 2312 has a bending position, this method can increase the complexity of the insulating sealing path at the position where the insulating sealing structure 233 and the edge portion 2312 are combined, and can increase the area of ​​the contact surface, thereby enhancing the insulation and sealing between the clamping structure 232 and the edge portion 2312, reducing the risk of electrolyte leakage at the position where the pole component 23 is located, and is also beneficial to improving the reliability of the battery cell 20.

[0217] In some embodiments of the present application, reference Figure 4 , Figure 6 and Figure 8 The edge portion 2312 is at least partially arranged parallel to the third arm portion 2303 .

[0218] For example, refer to Figure 4 , the edge portion 2312 can be arranged in parallel with the third arm portion 2303 as a whole; or, referring to Figure 6 and Figure 8 , a portion of the edge portion 2312 is arranged parallel to the third arm portion 2303 .

[0219] In the above technical solution, the edge portion 2312 is at least partially arranged parallel to the third arm portion 2303, and the distance between the edge portion 2312 and the third arm portion 2303 is relatively small. In this way, the compression amount of the insulating sealing structure 233 located between the edge portion 2312 and the third arm portion 2303 can be kept consistent, and it is conducive to maintaining a larger compression amount, which can improve the stability and reliability of insulation and sealing, reduce the risk of electrolyte leakage, and improve the reliability of the battery cell 20.

[0220] In some embodiments of the present application, reference Figure 4 , Figure 6 , Figure 8 , Figures 11 to 17 The edge portion 2312 is formed with a first recessed portion 2312a, and the third arm portion 2303 cooperates with the first recessed portion 2312a.

[0221] The first recessed portion 2312a may refer to a recessed space formed on the edge portion 2312. The first recessed portion 2312a may be, but is not limited to, a slope shape, a U-shaped structure, or the like.

[0222] “The third arm 2303 cooperates with the first recess 2312a” can be understood as the third arm 2303 cooperates with the first recess 2312a through the insulating sealing structure 233. Figure 4 , Figure 6 and Figure 8 The third arm portion 2303 is located outside the first recessed portion 2312a, and the third arm portion 2303 may also be partially located inside the first recessed portion 2312a.

[0223] In the above technical solution, the third arm 2303 cooperates with the first recessed portion 2312a through the insulating sealing structure 233, thereby making the first clamping member 2321 and the edge portion 2312 more tightly coupled, thereby enhancing the clamping strength of the clamping structure 232 on the edge portion 2312, and improving the installation reliability of the pole body 231. The first recessed portion 2312a can also increase the complexity of the contact surface between the edge portion 2312 and the insulating sealing structure 233, and increase the area of ​​the contact surface, thereby enhancing the insulation and sealing of the insulating sealing structure 233 between the edge portion 2312 and the first clamping member 2321, thereby also improving the reliability of the battery cell 20.

[0224] In some embodiments of the present application, reference Figures 4 to 9 , Figures 11 to 14 The third arm portion 2303 is protruded relative to the second arm portion 2302 in a direction close to the first recessed portion 2312a, and is insulated and sealedly connected to the first recessed portion 2312a through an insulating sealing structure 233.

[0225] For example, refer to Figures 4 to 7 The third arm portion 2303 can be bent relative to the second arm portion 2302 toward the direction close to the first recessed portion 2312a, thereby forming a protruding structure. Figures 8 to 9 The third arm portion 2303 may also be disposed on the end surface of the second arm portion 2302 close to the first shell wall 201 and protrude toward the direction close to the first recessed portion 2312a.

[0226] In the above technical solution, the third arm 2303 is protruded relative to the second arm 2302 in the direction close to the first recessed portion 2312a, so that the distance between the third arm 2303 and the first recessed portion 2312a is reduced, thereby further clamping the insulating sealing structure 233 and the edge portion 2312, improving the installation reliability of the insulating sealing structure 233 and the pole body 231, and thus improving the overall reliability of the pole component 23. Since the first recessed portion 2312a can increase the complexity and area of ​​the contact surface between the edge portion 2312 and the insulating sealing structure 233, on this basis, the above structure can increase the complexity and area of ​​the contact surface between the insulating sealing structure 233 and the first clamping member 2321, and further enhance the insulating sealing structure 233 at the first clamping member 2321 and the edge portion 2312, improve the insulation and sealing properties of the pole component 23, and thus improve the overall reliability of the battery cell 20.

[0227] In some embodiments of the present application, reference Figure 8 and Fig.17 The edge portion 2312 is also formed with a second recessed portion 2312 b, and the second clamping member 2322 cooperates with the second recessed portion 2312 b.

[0228] The second recessed portion 2312b may refer to a recessed space formed on the edge portion 2312. The second recessed portion 2312b may be, but is not limited to, a slope shape, a U-shaped structure, and the like.

[0229] "The second clamping member 2322 cooperates with the second recessed portion 2312b", refer to Figure 8 It can be understood that the second clamping member 2322 can be located outside the second recessed portion 2312b; or, the second clamping member 2322 can also be partially located inside the second recessed portion 2312b.

[0230] In the above technical solution, the second clamping member 2322 can cooperate with the second recessed portion 2312b through the insulating sealing structure 233, thereby making the second clamping member 2322 and the edge portion 2312 more tightly combined, thereby enhancing the clamping strength of the second clamping member 2322 on the edge portion 2312, and improving the installation reliability of the pole body 231. The second recessed portion 2312b can also increase the complexity of the contact surface between the edge portion 2312 and the insulating sealing structure 233, and increase the area of ​​the contact surface, thereby enhancing the insulation and sealing of the insulating sealing structure 233 between the edge portion 2312 and the second clamping member 2322, thereby also improving the reliability of the battery cell 20.

[0231] In some embodiments of the present application, reference Figure 8 and Fig. 9The second clamping member 2322 includes a fourth arm portion 2304 and a fifth arm portion 2305 connected to each other. The fourth arm portion 2304 is connected to the first arm portion 2301, and the fifth arm portion 2305 is protruded toward the side close to the second recessed portion 2312b, and is insulated and sealed from the second recessed portion 2312b through an insulating sealing structure 233.

[0232] In the above technical solution, the fifth arm 2305 can form a convex structure of the second clamping member 2322, and can be matched and connected with the second concave portion 2312b of the edge portion 2312 through the insulating sealing structure 233. With this structure, the second clamping member 2322 and the edge portion 2312 can be connected in a meshing manner, which can improve the connection strength and reliability of the second clamping member 2322 and the edge portion 2312. The above structure can also make the insulating and sealing path between the second clamping member 2322 and the edge portion 2312 of the insulating sealing structure 233 become tortuous and form a structure similar to an "S" shape, which can increase the complexity and area of ​​the contact surface between the insulating sealing structure 233, the second clamping member 2322, and the insulating sealing structure 233 and the edge portion 2312, thereby improving the insulation and sealing of the pole component 23 as a whole, and further improving the reliability of the battery cell 20 as a whole.

[0233] In some embodiments of the present application, reference Fig.15 and Fig.17 The local thickness of the edge portion 2312 is thinned to form a first recessed portion 2312a and / or a second recessed portion 2312b.

[0234] It is understood that the local thickness of the edge portion 2312 can be thinned to form a first recessed portion 2312a. The local thickness of the edge portion 2312 can also be thinned to form a second recessed portion 2312b. The local thickness of the edge portion 2312 can also be thinned to form both the first recessed portion 2312a and the second recessed portion 2312b. The local thickness of the edge portion 2312 can be gradually thinned, or it can be referred to as forming multiple regions with inconsistent thickness.

[0235] For example, refer to Fig.15 The bottom surface of the edge portion 2312 close to the first shell wall 201 is a straight surface, and the top surface away from the first shell wall 201 can be made into an inclined surface, thereby the thickness of the edge portion 2312 close to the main body 2311 is reduced to form a first recessed portion 2312a. Fig.17 The portion of the edge portion 2312 close to the main body portion 2311 may be thinned at both ends along the third direction Z, thereby forming a first recessed portion 2312a and a second recessed portion 2312b.

[0236] In the above technical solution, the first recessed portion 2312a and / or the second recessed portion 2312b are formed in the above manner, which is easy to process and manufacture, and can improve manufacturability, increase production efficiency, and reduce costs.

[0237] In some embodiments of the present application, reference Figure 4 , Figure 6 , Figure 8 , Figures 11 to 14 The insulating sealing structure 233 includes a first sealing member 2331 , and the first sealing member 2331 is sealingly disposed between the second clamping member 2322 and the pole body 231 .

[0238] The first seal 2331 may refer to a structure or component that plays a sealing role in the insulating seal structure 233. The first seal 2331 may be made of, but not limited to, a rubber material, a plastic material, etc. The rubber material may be, but not limited to, nitrile rubber, etc. The plastic material may be, but not limited to, tetrafluoroethylene, etc. Exemplarily, the first seal 2331 may be an annular component disposed around the circumference of the pole body 231, for example, the first seal 2331 may be a sealing ring.

[0239] In the above technical solution, the first seal 2331 can play a sealing role between the second clamp 2322 and the pole body 231, reduce the risk of electrolyte leakage from between the second clamp 2322 and the pole body 231, improve the sealing of the pole component 23, and thus improve the reliability of the battery cell 20.

[0240] In some embodiments of the present application, reference Figure 4 , Figure 6 , Figure 8 , Figures 11 to 14 The first sealing member 2331 includes a first portion 2306 and a second portion 2307 which are bent and connected. The pole body 231 includes a main body 2311 and an edge portion 2312. The first portion 2306 is sealed between the main body 2311 and the second clamping member 2322. The second portion 2307 is sealed between the edge portion 2312 and the second clamping member 2322.

[0241] The first sealing member 2331 can be divided into two parts, namely a first part 2306 and a second part 2307. The first part 2306 and the second part 2307 are connected by bending, so that the first sealing member 2331 as a whole can be but not limited to a V-shape, an L-shape, etc. The first part 2306 and the second part 2307 can both be annular parts.

[0242] In the above technical solution, the first part 2306 can play a sealing role between the main body 2311 and the second clamping member 2322, and the second part 2307 can play a sealing role between the edge part 2312 and the second clamping member 2322, so that the first seal 2331 can have a larger sealing surface, and enhance the sealing between the second clamping member 2322 and the pole body 231. The above structure also makes the first seal 2331 L-shaped, and can also increase the contact surface with the second clamping member 2322, and combine more tightly, which can improve the installation reliability of the first seal 2331 and the second clamping member 2322, reduce the risk of displacement or separation of the first seal 2331 during the assembly process, and then improve the sealing reliability of the pole component 23, thereby improving the overall reliability of the battery cell 20.

[0243] In some embodiments of the present application, reference Figure 4 , Figure 6 , Figure 8 , Figures 11 to 14 The pole component 23 also includes an insulating structure 234 insulated between the pole body 231 and the electrode component 22 , and the second portion 2307 is integrally arranged with the insulating structure 234 .

[0244] The insulating structure 234 may refer to a component that can play an insulating role, and may be, but not limited to, a plastic part, a rubber part, or a ceramic part, etc. The material of the plastic part may include, but not limited to, polypropylene, polycarbonate, or polystyrene, etc. The material of the rubber part may include, but not limited to, nitrile rubber, silicone rubber, etc. The material of the ceramic part may include, but not limited to, alumina ceramic, titanium dioxide ceramic, etc. Optionally, the insulating structure 234 may be a plastic bracket.

[0245] In the above technical solution, the insulating structure 234 can provide an effective insulating barrier on the side of the pole body 231 close to the electrode component 22, isolate the pole body 231 and the electrode component 22, reduce the risk of short circuit, and allow the current to flow along a predetermined path, which can improve the stability and reliability of the battery cell 20. The insulating structure 234 can also play a blocking role. On the one hand, it can block the electrolyte from flowing to the pole component 23, reducing the risk of electrolyte leakage, and can also block external moisture, dust and other impurities from entering the shell component 21, causing short circuits, corrosion and other problems in the battery cell 20. In other words, the insulating structure 234 is conducive to maintaining a clean environment inside the shell component 21, and can ensure that the chemical reaction inside the battery cell 20 can work normally. The insulating structure 234 can also play a buffering role between the first shell wall 201 and the electrode component 22, reducing the impact between the first shell wall 201 and the electrode component 22, and the probability of damage to the electrode component 22, which can improve the reliability of the battery cell 20.

[0246] In the above technical solution, "the second part 2307 and the insulating structure 234 are integrally arranged" may mean that the second part 2307 and the insulating structure 234 are integrally formed, or the second part 2307 is pre-connected with the insulating structure 234 to form an integral component. This method can make the installation of the first sealing member 2331 and the insulating structure 234 simpler, simplify the assembly process, reduce the assembly steps, and thus improve the production efficiency of the battery cell 20.

[0247] In some embodiments of the present application, reference Figure 4 The insulating sealing structure 233 further includes a second sealing member 2332 , which is sealingly disposed between the first clamping member 2321 and the pole body 231 , and the second sealing member 2332 is spaced apart from the first sealing member 2331 .

[0248] The explanation of the second sealing member 2332 can refer to the first sealing member 2331 mentioned above, and will not be repeated here. The second sealing member 2332 can be an annular member.

[0249] The second sealing member 2332 is spaced apart from the first sealing member 2331 , which can be understood as a gap 237 (see FIG. Figure 4 ). Since the second seal 2332 and the first seal 2331 will expand when compressed, a certain amount of release space is required, and the gap 237 can provide the release space. The second seal 2332 and the first seal 2331 will release gas when compressed, and the gap 237 can store the released gas, reducing the risk of the gas released by the second seal 2332 and the first seal 2331 entering the shell part 21 and contaminating the electrolyte, which is beneficial to improving the stability of the chemical reaction inside the battery cell 20. The gap 237 can also relieve pressure, reducing the expansion force formed by the extrusion of the second seal 2332 and the first seal 2331, which reacts on the clamping structure 232 and causes the clamping structure 232 to be damaged.

[0250] In the above technical solution, the second seal 2332 can be used as the first sealing line between the pole body 231 and the clamping structure 232, and the first seal 2331 can be used as the second sealing line between the pole body 231 and the clamping structure 232. The cooperation between the second seal 2332 and the first seal 2331 can provide more comprehensive sealing protection, further reduce the risk of electrolyte leakage from the pole component 23 to the outside, and reduce the risk of external impurities such as water and dust entering the pole component 23, thereby improving the sealing reliability of the pole component 23, and thus improving the reliability of the battery cell 20. By setting the second seal 2332 and the first seal 2331 at an interval, the space required for the second seal 2332 and the first seal 2331 to expand and deform can be provided, the gas compressed by the second seal 2332 and the first seal 2331 can be stored, and the probability of the clamping structure 232 being damaged by the gas is reduced, the reliability of the pole component 23 can be improved, and the risk of the released gas contaminating the electrolyte can be reduced, thereby ensuring the stability of the chemical reaction inside the battery cell 20, which is beneficial to improving the reliability of the battery cell 20.

[0251] In some embodiments of the present application, reference Figure 4 , part of the second seal 2332 extends between the second clamp 2322 and the pole body 231, and is spaced apart from the first seal 2331. In this technical solution, the second seal 2332 can be wrapped around the position where the second clamp 2322 and the first arm 2301 are connected, which is conducive to forming a more complex sealing path for the second seal 2332, and can further improve the sealing performance of the second seal 2332 between the clamping structure 232 and the pole body 231. In addition, the above structure can also make the corner position of the clamping structure 232 and the pole body 231 more closely connected, which is conducive to improving the connection reliability of the clamping structure 232 and the pole body 231, and improving the overall reliability of the pole component 23.

[0252] In some embodiments of the present application, part of the first seal 2331 may extend between the first clamp 2321 and the pole body 231, and be spaced apart from the second seal 2332. In this technical solution, the first seal 2331 may be wrapped around the position where the second clamp 2322 and the first arm 2301 are connected, which is conducive to forming a more complex sealing path for the first seal 2331, and can further improve the sealing performance of the first seal 2331 between the clamping structure 232 and the pole body 231. Moreover, the above structure can also make the corner position of the clamping structure 232 and the pole body 231 more closely connected, which is conducive to improving the connection reliability of the clamping structure 232 and the pole body 231, and improving the overall reliability of the pole component 23.

[0253] In some embodiments of the present application, reference Figure 4 The insulating sealing structure 233 further includes an insulating member 2333 , and the insulating member 2333 is disposed on an outer surface 2321 a of the first clamping member 2321 away from the clamping groove 2323 .

[0254] The explanation of the insulating member 2333 can refer to the insulating structure 234 mentioned above, which will not be repeated here.

[0255] It can be understood that a first seal 2331 is provided between the second clamping member 2322 and the pole body 231, and on the basis of a second seal 2332 is provided between the first clamping member 2321 and the pole body 231, an insulating member 2333 can be provided on the outer surface 2321a of the first clamping member 2321 away from the clamping groove 2323, thereby the insulating member 2333 can play an insulating role on the outer peripheral side of the first clamping member 2321.

[0256] In the above technical solution, the insulating member 2333 is arranged on the outer surface 2321a of the first clamping member 2321 away from the clamping groove 2323, so as to play an insulating protection role on the outer side of the first clamping member 2321, reduce the risk of short circuit on the first clamping member 2321, and reduce the occurrence of chemical corrosion. Moreover, the insulating member 2333 can also play a protective role, reducing the risk of damage to the outer side of the first clamping member 2321 caused by impact or bump, which is beneficial to improve the reliability of the pole component 23, and further improve the reliability of the battery cell 20.

[0257] In some embodiments of the present application, reference Figure 6 , Figure 8 , Figures 11 to 14 The insulating sealing structure 233 also includes an insulating member 2333 , and the insulating member 2333 includes a first insulating portion 2308 , which is disposed between the first clamping member 2321 and the pole body 231 .

[0258] Optionally, the insulating member 2333 may be an injection molded member. The insulating member 2333 may be a structural member obtained by injection molding, or may be directly injection molded between the clamping structure 232 and the pole body 231. The insulating member 2333 may include only the first insulating portion 2308, or may include other portions, which are not specifically limited here.

[0259] In the above technical solution, the first insulating part 2308 can play an insulating role between the first clamping part 2321 and the pole body 231, reducing the risk of short circuit or other electrical safety accidents, and the first insulating part 2308 can also play a sealing role before the first seal 2331. The first insulating part 2308 serves as a sealing line of defense, and the first seal 2331 serves as another sealing line of defense, thereby playing a double protection role, reducing the probability of electrolyte leakage from the inside of the shell part 21, and can effectively resist moisture and dust intrusion, thereby improving the reliability of the battery cell 20.

[0260] In some embodiments of the present application, reference Figure 6 , Figure 8 , Figures 11 to 14 The insulating member 2333 further includes a second insulating portion 2309 , which is disposed on an outer surface 2321 a of the first clamping member 2321 away from the clamping groove 2323 and connected to the first insulating portion 2308 .

[0261] The “outer surface 2321a of the first clamping member 2321 facing away from the clamping groove 2323” can be seen Figure 6 , Figure 8 and Fig. 9 .

[0262] It can be understood that the insulating member 2333 can include two parts, the inner and outer parts. The inner part is the first insulating part 2308, which is arranged between the first clamping member 2321 and the pole body 231, and the outer part is the second insulating part 2309, which is wrapped around the outer surface 2321a of the first clamping member 2321.

[0263] During the assembly and use of the battery cell 20, the pole body 231 may accidentally come into contact with surrounding metal parts (such as the shell part 21, the poles of other battery cells 20 or the conductive connecting parts in the battery pack, etc.). If there is no insulation protection, a short circuit is likely to occur. The pole body 231 is a key component for current entering and exiting the battery cell 20. By wrapping the second insulating part 2309 on the outer surface 2321a of the first clamping member 2321 away from the clamping groove 2323, the second insulating part 2309 can provide an effective insulation barrier to reduce the probability of a short circuit in the pole part 23.

[0264] In some cases, in high-voltage battery cells, uneven electric fields may cause local discharge and damage the performance and life of the battery. By covering the outer surface 2321a of the first clamping member 2321 away from the clamping groove 2323 with the second insulating portion 2309, a uniform insulating environment can be formed around the pole body 231, which helps to stabilize the electric field distribution around the pole body 231.

[0265] In other cases, during the transportation, installation and use of the battery cell 20, the pole body 231 may also be subjected to various external impacts, such as collision, vibration, etc. The second insulating part 2309 can play a buffering role on the periphery of the clamping structure 232, absorb part of the external force, and reduce the risk of direct impact on the pole body 231, which is beneficial to ensure the integrity and conductivity of the pole body 231.

[0266] In the above technical solution, the above structure can play an insulating protection role in the outer circumferential direction of the pole body 231, reduce the risk of electrical safety accidents such as short circuits, stabilize the surrounding electric field distribution, and reduce the probability of damage to the battery cell 20 due to uneven electric field. The second insulating portion 2309 can also form a protective layer on the circumferential side of the first clamping member 2321, which can play a buffering and vibration reduction role, thereby reducing the impact on the pole body 231 and reducing the probability of damage to the pole body 231, thereby improving the reliability of the battery cell 20.

[0267] In some embodiments of the present application, reference Figure 4 , Figure 6 , Figure 8 , Figures 11 to 14 The pole body 231 includes a pole outer protrusion 2313 located in the inner ring area of ​​the first clamping piece 2321, and the pole outer protrusion 2313 protrudes toward the outer side of the first shell wall 201 relative to the first clamping piece 2321. A side surface 23101 of the pole outer protrusion 2313 away from the electrode component 22 includes a central area 23131 and a peripheral area 23132. The peripheral area 23132 is arranged around the central area 23131, and the central area 23131 protrudes toward the outer side of the first shell wall 201 relative to the peripheral area 23132. The side surface of the second insulating part 2309 away from the electrode component 22 is flush with the peripheral area 23132.

[0268] In the above technical solution, in the side surface 23101 of the pole outer protrusion 2313 away from the electrode component 22, the central area 23131 protrudes toward the outside of the first shell wall 201 relative to the peripheral area 23132, so that the central area 23131 is less blocked on the surrounding side, and the central area 23131 is easy to be connected with other power connection components such as bus bars and bars. For example, the central area 23131 can be welded conveniently. By making the surface of one side of the second insulating portion 2309 away from the electrode component 22 flush with the peripheral area 23132, the probability of a large height difference between the pole protrusion 2313 and the second insulating portion 2309 can be reduced. This helps reduce the risk of forming a short-circuit channel due to foreign objects (such as metal debris, wires, etc.) accidentally falling into the height difference between the pole protrusion 2313 and the second insulating portion 2309 during the use or transportation of the battery cell 20. It can also reduce the probability of stress concentration due to the formation of the height difference, which is beneficial to improving the reliability of the battery cell 20.

[0269] In some embodiments of the present application, reference Figure 6 , Figure 8 , Figure 12 to Figure 14 , Fig.18 and Fig.19 The first insulating part 2308 and the second insulating part 2309 are integrally or separately arranged.

[0270] Reference Fig.12 and Fig.18 The first insulating portion 2308 and the second insulating portion 2309 are integrally provided, for example, the first insulating portion 2308 and the second insulating portion 2309 can be formed by one-time injection molding. Fig.13 , Fig.14 and Fig.19 The first insulating portion 2308 and the second insulating portion 2309 may also be separately provided. For example, the first insulating portion 2308 and the second insulating portion 2309 may be plastic parts and assembled separately.

[0271] In the above technical solution, the first insulating part 2308 and the second insulating part 2309 are integrally arranged, which can reduce the number of parts, reduce assembly steps, and improve assembly efficiency. The first insulating part 2308 and the second insulating part 2309 are separately arranged, which can make it easier to control the quality of the first insulating part 2308 and the second insulating part 2309, reduce the difficulty of maintenance, and facilitate control of product quality.

[0272] In some embodiments of the present application, the first insulating portion 2308 is injection molded between the first clamping member 2321 and the pole body 231 ; and / or the second insulating portion 2309 is injection molded on an outer surface 2321 a of the first clamping member 2321 away from the clamping groove 2323 .

[0273] The first insulating portion 2308 can be injection molded between the first clamping member 2321 and the pole body 231, and the molding method of the second insulating portion 2309 is not limited; alternatively, the second insulating portion 2309 can be injection molded on the outer surface 2321a of the first clamping member 2321 away from the clamping groove 2323, and the molding method of the first insulating portion 2308 is not limited; alternatively, the first insulating portion 2308 is injection molded between the first clamping member 2321 and the pole body 231, and the second insulating portion 2309 is injection molded on the outer surface 2321a of the first clamping member 2321 away from the clamping groove 2323.

[0274] In the above technical solution, the first insulating part 2308 is injection molded between the first clamping piece 2321 and the pole body 231, so that the installation of the first insulating part 2308, the first clamping piece 2321 and the pole body 231 can be relatively easy, which can save time and improve assembly efficiency. It is also beneficial to reduce the gap between the first insulating part 2308, the first clamping piece 2321 and the pole body 231, reduce the risk of electrolyte leakage, and improve the bonding strength of the first insulating part 2308, the first clamping piece 2321 and the pole body 231, thereby improving the overall connection reliability of the pole component 23. By injection molding the second insulating part 2309 on the outer surface 2321a of the first clamping piece 2321 away from the clamping groove 2323, the second insulating part 2309 can be easily installed on the first clamping piece 2321, which can save time and improve assembly efficiency. It is also beneficial to reduce the gap between the second insulating part 2309 and the first clamping piece 2321, reduce the risk of electrolyte leakage, and improve the bonding strength between the second insulating part 2309 and the first clamping piece 2321, thereby improving the overall connection reliability of the pole component 23.

[0275] In some embodiments of the present application, reference Fig.18 The first insulating part 2308 is injection molded between the first clamping piece 2321 and the pole body 231, and the second insulating part 2309 is injection molded on the outer surface 2321a of the first clamping piece 2321 away from the clamping groove 2323; the first clamping piece 2321 has a through hole 2321b, and part of the second insulating part 2309 is penetrated through the through hole 2321b and connected to the first insulating part 2308.

[0276] In the above technical solution, the first insulating part 2308 and the second insulating part 2309 can be an integral part. When the first insulating part 2308 and the second insulating part 2309 are integrally injection molded, the injection liquid can form the second insulating part 2309 on the outer surface 2321a of the first clamping part 2321 away from the clamping groove 2323, while a part of the injection liquid enters between the first clamping part 2321 and the pole body 231 from the outside of the first clamping part 2321, and another part of the injection liquid directly enters between the first clamping part 2321 and the pole body 231 from the through hole 2321b, thereby forming the first insulating part 2308. In this way, the flow rate of the injection liquid can be increased, thereby improving the molding efficiency and saving time.

[0277] In some embodiments of the present application, the first clamping member 2321 and the second clamping member 2322 are integrally formed; and / or the first clamping member 2321, the second clamping member 2322 and the first shell wall 201 are all integrally formed.

[0278] Reference Figure 5 , Figure 7 and Fig. 9 The first clamping member 2321 and the second clamping member 2322 can be formed by riveting the same component, or can be integrally cast, injection molded, or extruded, and there is no specific limitation here.

[0279] The first clamping member 2321 , the second clamping member 2322 and the first shell wall 201 are integrally formed by casting, injection molding or extrusion molding, and no specific limitation is made here.

[0280] In the above technical solution, the first clamping member 2321 and the second clamping member 2322 are formed in one piece, the overall consistency of the clamping structure 232 is good, the strength and rigidity are high, the reliability is good, and the number of parts of the pole component 23 can be reduced, and the assembly efficiency is improved. The first clamping member 2321, the second clamping member 2322 and the first shell wall 201 are formed in one piece, thereby further reducing the number of parts, simplifying the assembly process, and improving the assembly efficiency. There can be no gap between the first clamping member 2321 and the second clamping member 2322 and the first shell wall 201, which can reduce the sealing failure path and improve the reliability of the battery cell 20.

[0281] In some embodiments of the present application, reference Fig. 20 The clamping structure 232 includes an inner ring segment 2324 and an outer ring segment 2325 arranged around the inner ring segment 2324, the outer ring segment 2325 is connected to the first shell wall 201, a part of the inner ring segment 2324 forms the second clamping member 2322, and the other part is riveted to form the first clamping member 2321.

[0282] The clamping structure 232 may be a metal part, for example, the clamping structure 232 may be made of aluminum. Optionally, the clamping structure 232 may be pre-formed with an outer ring segment 2325, wherein the outer ring segment 2325 may refer to a part that is not further processed after being pre-formed, and the inner ring segment 2324 may refer to a part that needs to be re-formed later, see Fig. 20 The insulating sealing structure 233 may include a first sealing member 2331 and a second sealing member 2332. The edge portion 2312 may be assembled to the second clamping member 2322 through the first sealing member 2331, and then the second sealing member 2332 is assembled to the edge portion 2312 and the main body portion 2311. Finally, the inner ring segment 2324 is riveted to form the first clamping member 2321, and is clamped on the second sealing member 2332 in cooperation with the second clamping member 2322 to form Figure 4 The pole part 23 is shown.

[0283] In other examples, the first seal 2331 can also be assembled later. For example, the inner ring segment 2324 is bent toward the edge portion 2312 by riveting to form the first arm 2301, the second arm 2302 and the third arm 2303. Then, the second seal 2332 is injection molded in the gap formed between the first clamp 2321 and the pole body 231.

[0284] In the above technical solution, the clamping structure 232 is an integrally formed part, and the first clamping part 2321 and the second clamping part 2322 can be formed by riveting. Therefore, the overall consistency of the clamping structure 232 is better, and the connection gap is smaller, which can enhance the connection strength between the clamping structure 232 and the pole body 231 and reduce the risk of loosening. In addition, the riveting and pressing method can also form a good sealing effect, further improving the sealing between the clamping structure 232 and the pole body 231, which is beneficial to improving the reliability of the clamping structure 232, and then improving the reliability of the pole component 23.

[0285] In some embodiments of the present application, reference Figure 5 , the length of the second clamping member 2322 in the direction from the first shell wall 201 to the pole body 231 is L1, and the thickness of the second clamping member 2322 is H1, satisfying the relationship:

[0286] y=-(P·L1 4 ) / 8E(b·H1 3 / 12);

[0287] Wherein, y is the disturbance of the second clamping member 2322, which should be less than 25% of the compression of the insulating sealing structure 233, and the unit is mm;

[0288] P is the maximum rebound force of the insulating sealing structure 233 after compression, in N;

[0289] E is the elastic modulus of the second clamping member 2322, in GPa;

[0290] b is the circumference of the second clamping member 2322 in the circumferential direction of the pole body 231 , in mm.

[0291] The “thickness direction of the first shell wall 201” may be a reference Figure 7 The third direction Z.

[0292] “The second clamping member 2322 is in the direction from the first shell wall 201 to the pole body 231” can refer to Figure 7 The first direction X.

[0293] y is the disturbance of the second clamping member 2322, which can be determined according to the compression amount of the portion of the insulating sealing structure 233 located between the edge portion 2312 and the second clamping member 2322. Exemplarily, the compression amount of the portion of the insulating sealing structure 233 located between the edge portion 2312 and the second clamping member 2322 can be 1 mm, and the disturbance y of the second clamping member 2322 can be less than 0.25 mm.

[0294] The portion of the insulating sealing structure 233 between the edge portion 2312 and the second clamping member 2322 can be recorded as a first sealing member 2331 , and the P value can be calculated by multiplying the pressure area of ​​the first sealing member 2331 by the stress per unit area.

[0295] In the above technical solution, by adopting the above formula, a more suitable thickness and length of the second clamping member 2322 can be calculated, so that the second clamping member 2322 has higher strength and rigidity, which can reduce the probability of the second clamping member 2322 being greatly deformed when the pole body 231 is subjected to force, and can also reduce the probability of the pole body 231 escaping from the second clamping member 2322. This can improve the reliability of the insulating sealing structure 233 between the clamping structure 232 and the pole body 231, reduce the risk of insulation and sealing failure, and improve the reliability of the battery cell 20.

[0296] In some embodiments of the present application, reference Fig.21 and Fig. 22 The first clamping member 2321 includes a plurality of riveted portions 301 arranged at intervals along a direction surrounding the pole body 231 , and discontinuous gaps 302 are formed between adjacent riveted portions 301 .

[0297] In the above technical solution, the first clamping member 2321 fixes the pole body 231 by riveting. Since the first clamping member 2321 surrounds the pole body 231 and forms an intermittent notch 302 between adjacent riveted portions 301, it can improve the problem of material piling or bulging at the corners when the riveted portions 301 are formed by riveting, which leads to the formation of bulges on the first clamping member 2321. This is beneficial to improving the regularity of the clamping structure 232 and is beneficial to injection molding and encapsulation.

[0298] In some embodiments of the present application, reference Fig.21 and Fig. 22 The outline of the pole body 231 is a runway shape, which is composed of a rectangle 303 and two semicircles 304 located at both ends of the length of the rectangle 303. The riveted portion 301 includes a first riveted portion 3011 disposed at both ends of the length of the pole body 231, and a second riveted portion 3012 disposed at both ends of the width of the pole body 231. The discontinuous notch 302 is formed between the first riveted portion 3011 and the second riveted portion 3012, and is arranged opposite to the connection position of the rectangle 303 and the semicircle 304.

[0299] It can be understood that the first clamping member 2321 may include two shorter first riveted portions 3011 and two longer second riveted portions 3012, and the two first riveted portions 3011 and the two second riveted portions 3012 also form a runway-shaped profile. With this solution, the number of first riveted portions 3011 and second riveted portions 3012 is small, which can save riveting time. Moreover, since the number of first riveted portions 3011 and second riveted portions 3012 is small, the length of each first riveted portion 3011 and second riveted portion 3012 is also large, and the first riveted portions 3011 and second riveted portions 3012 have higher strength and rigidity, which can improve the reliability of riveting fixation, thereby improving the overall reliability of the pole component 23.

[0300] Since the clamping structure 232 is riveted to form the first riveted portion 3011 and the second riveted portion 3012, during the riveting process, due to the severe extrusion at the corner position of the runway shape, problems such as material piling or bulging are prone to occur. By arranging the intermittent notch 302 relative to the connection position of the rectangle 303 and the semicircle 304, the material piling at the corner position of the first clamping member 2321 can be improved, thereby improving the overall effect of improving the material piling of the first clamping member 2321 and improving the regularity of the outer peripheral side of the clamping structure 232.

[0301] In the above technical solution, the number of the first riveted parts 3011 and the second riveted parts 3012 formed by the above structure is small, and the strength and rigidity are relatively high, which is beneficial to improve the clamping strength of the first clamping member 2321 on the pole body 231, improve the installation reliability of the clamping structure 232 and the pole body 231, and improve the stacking or bulging effect of the first clamping member 2321 during the riveting forming process, which can improve the regularity of the outer contour of the first clamping member 2321, thereby improving the overall reliability of the battery cell 20.

[0302] In some embodiments of the present application, reference Fig. 22 The first clamping member 2321 is disposed on a side of the second clamping member 2322 away from the electrode component 22 , and is provided with an intermittent notch 302 communicating with the clamping groove 2323 .

[0303] In the above technical solution, the first clamping member 2321 can be arranged on the outer side of the first shell wall 201, and the first clamping member 2321 is provided with a discontinuous notch 302 connected to the clamping groove 2323. In this way, the first clamping member 2321 can be divided into multiple parts, which can reduce the difficulty of forming the first clamping member 2321. For example, the clamping structure 232 forms the first clamping member 2321 by riveting or bending, and the multiple parts separated by the first clamping member 2321 can be riveted or bent respectively, which can reduce the difficulty of one riveting or bending, thereby improving manufacturability. The discontinuous notch 302 can also reduce the weight of the first clamping member 2321, which is conducive to improving the volume energy density of the battery cell 20.

[0304] In some embodiments of the present application, reference Fig. 22 There are multiple discontinuous notches 302 and they are arranged at intervals along the direction in which the clamping structure 232 surrounds the pole body 231 .

[0305] The clamping structure 232 can be a preformed part, that is, it can be pre-fabricated by methods including but not limited to injection molding, stamping or extrusion molding. The clamping structure 232 can also be fixed to the pole body 231 by riveting through the insulating sealing structure 233. During the riveting molding process, material extrusion will occur, especially at the corner position to form a pile or bulge. By providing a plurality of intermittent notches 302, more space can be provided to release the extruded material, and the effect of improving the pile or bulge during the riveting molding process of the clamping structure 232 is also better.

[0306] Multiple discontinuous notches 302 can also further reduce the overall weight of the clamping structure 232 and reduce the material usage of the clamping structure 232, which can reduce the overall weight of the pole component 23. The lighter pole component 23 is also easier to install on the shell component 21, which is beneficial to improving assembly efficiency and can also increase the volume energy density of the battery cell 20.

[0307] In the above technical solution, the plurality of discontinuous notches 302 are conducive to reducing the difficulty of forming the clamping structure 232 during the manufacturing process, which can improve the manufacturability of the clamping structure 232, improve the product yield, and thus improve the product qualification rate of the battery cell 20. The plurality of discontinuous notches 302 can also greatly reduce the weight of the clamping structure 232, save materials, reduce costs, and also improve the energy density of the battery cell 20.

[0308] In some embodiments of the present application, reference Figure 4 , Figure 6 , Figure 8 , Figure 12 to Figure 14 , Fig.21 and Fig. 22 The insulating sealing structure 233 includes an insulating member 2333, and the insulating member 2333 includes a first insulating portion 2308 and a second insulating portion 2309. The first insulating portion 2308 is injection molded between the first clamping member 2321 and the pole body 231, and the second insulating portion 2309 is injection molded on the outer surface 2321a of the clamping groove 2323 formed by the first clamping member 2321, and is partially connected to the first insulating portion 2308 through the discontinuous notch 302.

[0309] In the above technical solution, during the process of injection molding the second insulating part 2309 on the outer surface 2321a of the clamping groove 2323 formed by the first clamping piece 2321, the injection liquid can enter the gap between the first clamping piece 2321 and the pole body 231 through the intermittent notch 302 to form the first insulating part 2308. As a result, the first insulating part 2308 and the second insulating part 2309 can be injection molded at one time, which simplifies the assembly process of the pole component 23. Moreover, the intermittent notch 302 is a notch formed on the first clamping piece 2321. Compared with the simple hole opening method, the opening size of the intermittent notch 302 is larger, which can increase the circulation rate of the injection liquid, thereby improving the molding efficiency of the first insulating part 2308 and the second insulating part 2309, and improving the overall assembly efficiency of the pole component 23.

[0310] In some embodiments of the present application, reference Fig.15 The pole body 231 includes a first metal part 305 and a second metal part 306 made of different materials. The first metal part 305 is located on the side of the second metal part 306 away from the electrode component 22. The second metal part 306 is connected to the electrode component 22. The outer periphery of the first metal part 305 and the outer periphery of the second metal part 306 adjacent to the first metal part 305 are both covered with a protective metal layer 307.

[0311] The first metal part 305 and the second metal part 306 can both be metal plates or metal blocks, and are arranged in layers. The materials of the first metal part 305 and the second metal part 306 can be, but are not limited to, aluminum, copper, lead, zinc alloy, copper-aluminum alloy, etc., wherein the materials of the first metal part 305 and the second metal part 306 are different. Exemplarily, the first metal part 305 can be an aluminum part, and the second metal part 306 can be a copper part. Exemplarily, referring to Fig.15 The first metal part 305 can be a copper block, and the second metal part 306 can be an aluminum plate, which is fixed to the bottom of the copper block.

[0312] The material of the protective metal layer 307 may be but is not limited to nickel, zinc, tin, chromium or copper, etc. The protective metal layer 307 may be a metal plating layer.

[0313] In the above technical solution, by setting the pole body 231 to include a first metal part 305 and a second metal part 306 of different materials, the pole body 231 can be made of a metal of a suitable material as needed. For example, the first metal part 305 and the second metal part 306 can be made of metal materials with different conductivities. This can reduce costs while ensuring the overall conductivity requirements. A lighter metal material can also be selected to reduce the overall weight of the pole body 231 and improve the energy density of the battery cell 20. Metal materials with different weldability can also be selected as needed, which is beneficial to the welding of the pole body 231 and other power-connecting components, thereby improving the manufacturability of the battery cell 20.

[0314] In some embodiments of the present application, the pole body 231 is a metal piece with the same material in all places. For example, the pole body 231 can be made of all aluminum or all copper. In this technical solution, the pole body 231 with this structure is relatively simple to manufacture, which can reduce the manufacturing cost.

[0315] In some embodiments of the present application, reference Figure 6 , Figure 8 , Figures 11 to 14 The pole component 23 defines a receiving groove 235 that is recessed in a direction away from the electrode component 22, and the pole body 231 defines a groove end wall 2351 on the side of the receiving groove 235 away from the electrode component 22. The electrode component 22 includes an active material coating portion 221 and a conductive portion 222, and at least a portion of the conductive portion 222 is received in the receiving groove 235 and connected to the groove end wall 2351.

[0316] The receiving groove 235 may refer to a space having a certain size. The groove end wall 2351 may refer to a groove wall surface forming the receiving groove 235 .

[0317] The active material coating part 221 may refer to a component consisting of a current collector and an active material layer coated on the current collector, and may include a positive electrode active material coating part and a negative electrode active material coating part.

[0318] The conductive portion 222 may refer to a structure of the current collector that is not coated with an active material layer, and may be understood as a tab for electrically connecting the pole body 231. The conductive portion 222 may be partially located in the receiving groove 235, or entirely located in the receiving groove 235.

[0319] In the above technical solution, since the conductive part 222 of the electrode component 22 needs to occupy a certain space, a receiving groove 235 is defined by the pole component 23, and at least a portion of the conductive part 222 is received in the receiving groove 235 and connected to the groove end wall 2351, so that the pole component 23 can provide a receiving space for the conductive part 222, saving space in the shell component 21, which is conducive to arranging a larger active material coating part 221 in the shell component 21, and the receiving groove 235 is also conducive to reducing the weight of the pole component 23, thereby improving the energy density of the battery cell 20.

[0320] In some embodiments of the present application, reference Figure 6 , Figure 8 , Figures 11 to 14 The pole component 23 further includes an insulating structure 234 , which is disposed on one side of the clamping structure 232 close to the electrode component 22 . The insulating structure 234 and the insulating sealing structure 233 jointly define a groove peripheral wall 2352 of the accommodating groove 235 .

[0321] In the above technical solution, the groove peripheral wall 2352 of the receiving groove 235 is defined by the insulating structure 234 and the insulating sealing structure 233, so that a deeper receiving groove 235 can be formed, providing a larger space to accommodate the conductive part 222, and further saving the space inside the shell component 21. Since the insulating structure 234 and the insulating sealing structure 233 both have an insulating function, the above structure can also insulate the conductive part 222 from the pole body 231, which is conducive to reducing the risk of short circuit and improving the reliability of the battery cell 20.

[0322] In some embodiments of the present application, reference Figure 4 , Fig.14 , Fig.23The pole component 23 also includes an insulating structure 234, which is arranged on the side of the clamping structure 232 close to the electrode component 22. The pole body 231 includes a pole inner protrusion 2314 located in the inner ring area of ​​the insulating structure 234. The pole inner protrusion 2314 protrudes toward the inner side of the first shell wall 201 relative to the clamping structure 232. The side surface of the pole inner protrusion 2314 close to the electrode component 22 is flush with the side surface of the insulating structure 234 close to the electrode component 22, or is located on the side of the side surface of the insulating structure 234 close to the electrode component 22 away from the electrode component 22.

[0323] The inner convex portion 2314 of the pole may refer to a portion of the pole body 231 that protrudes toward the inner side of the housing component 21. Figure 4 , Fig.14 , Fig.15 and Fig. 22 For example, refer to Figure 4 The side surface of the inner convex portion 2314 of the pole close to the electrode component 22 is located on the side of the side surface of the insulating structure 234 close to the electrode component 22 away from the electrode component 22. Fig.14 and Fig.23 The surface of one side of the inner protrusion 2314 of the pole close to the electrode component 22 is flush with the surface of one side of the insulating structure 234 close to the electrode component 22 .

[0324] In the above technical solution, by forming the pole inner protrusion 2314 on the pole body 231, the connection area between the pole body 231 and the clamping structure 232 can be made larger, the connection reliability can be improved, and it is beneficial to improve the stability and reliability of the overall structure of the pole component 23. By making the pole inner protrusion 2314 flush with the surface of one side of the insulating structure 234 close to the electrode component 22, the surrounding obstruction of the pole inner protrusion 2314 can be relatively small, and the pole inner protrusion 2314 is easier to connect with the electrode component 22, which can reduce the difficulty of assembly, improve assembly efficiency, and also help to improve product yield. By the pole inner protrusion 2314 being located on the side of the side surface of the insulating structure 234 close to the electrode component 22 away from the electrode component 22, the insulating structure 234 and the pole inner protrusion 2314 can form a certain space for accommodating the electrode component 22, thereby saving the internal space of the shell component 21 and improving the energy density of the battery cell 20.

[0325] In some embodiments of the present application, reference Fig.10 The battery cell 20 further includes a pressure relief device 24 , which is disposed on the housing component 21 and is located on the same side or on the opposite side as the pole component 23 .

[0326] The pressure relief device 24 may refer to a component or structure that can release gas after the gas pressure inside the shell component 21 reaches a set threshold. The pressure relief device 24 may be a component such as an explosion-proof valve or a pressure relief valve, or may be a notch or thinned area set on the shell wall of the shell component 21. For example, refer to Fig.10 The pressure relief device 24 can be located on the same side as the pole component 23. Alternatively, the pressure relief device 24 can also be arranged on a different side from the pole component 23.

[0327] Reference Figure 3 and Fig.10 The housing component 21 may include a housing 211 and a cover 212 , wherein the housing 211 has an opening and the cover 212 closes the opening. The pressure relief device 24 may be disposed on the housing 211 or the cover 212 .

[0328] In the above technical solution, by arranging the pressure relief device 24 in the shell part 21, the gas can be exhausted and pressure relieved in time when the internal air pressure of the shell part 21 is high, thereby reducing the risk of thermal runaway of the battery cell 20, which is beneficial to improving the reliability of the battery cell 20. The pressure relief device 24 and the pole part 23 are located on the same side or on different sides, which can provide more possibilities for the arrangement of the pressure relief device 24, which is beneficial to realize flexible design and reduce manufacturing costs.

[0329] In some embodiments of the present application, reference Figure 3 , Fig.24 and Fig.25 The first shell wall 201 is provided with a mounting hole 201 a, and the pole component 23 is mounted at the mounting hole 201 a.

[0330] The clamping structure 232 can be used as a transition structure between the first shell wall 201 and the pole body 231, see Fig. 20 and Fig.25 In this solution, the pole body 231 can be first assembled with the clamping structure 232 and the insulating sealing structure 233 to form the pole component 23, and then the conductive part 222 (pole ear) of the electrode component 22 is pulled out of the shell component 21, and the conductive part 222 is connected to the pole body 231 (the connection method can be but not limited to welding, etc.), and finally, the clamping structure 232 is installed in the installation hole 201a of the first shell wall 201 on the outside of the shell component 21. The connection method of the clamping structure 232 and the first shell wall 201 can be but not limited to welding, etc.

[0331] In the above assembly process, since the thickness of the shell component 21 is generally thin, especially in the trend of pursuing higher energy density, the thickness of the shell component 21 is gradually reduced. If the connection between the pole body 231 and the first shell wall 201 is relatively complicated or the connection steps are relatively cumbersome, it is easy to increase the probability of damage to the shell component 21, affecting the reliability of the battery cell 20. For example, when the pole is connected to the shell by riveting, since the shell is relatively thin, the shell wall of the shell is easily damaged during the riveting process, thereby affecting the reliability of the battery cell. In the above technical solution of the present application, the steps of insulation, sealing and fixing of the pole body 231 can be performed before the step of connecting with the shell component 21. This can simplify the installation process of the pole body 231 and the shell component 21, reduce the probability of damage to the shell component 21 and the pole body 231 during the installation process, improve the integrity of the shell component 21, and help improve the reliability of the battery cell 20. Moreover, as analyzed above, the above solution is also conducive to reducing the thickness of the shell component 21, which is conducive to reducing the weight of the battery cell 20 and improving the volume energy density of the battery cell 20.

[0332] The connection method between the pole body 231 and the conductive part 222 may be, but is not limited to, ultrasonic welding, ultrasonic pre-welding + laser welding, resistance welding, pressure fusion welding, brazing, bonding, etc. The connection method between the clamping structure 232 and the first shell wall 201 may be, but is not limited to, ultrasonic welding, ultrasonic pre-welding + laser welding, resistance welding, pressure fusion welding, brazing or riveting, etc.

[0333] The embodiment of the present application provides a battery device 100, including a battery cell 20 in any of the above embodiments.

[0334] In the above technical solution, since the battery cell 20 has a higher reliability, the reliability of the battery device 100 using the battery cell 20 can be improved, so that the battery device 100 can have a better performance.

[0335] In some embodiments of the present application, reference Figure 2 The battery device 100 includes a box body 10, a plurality of battery cells 20 are accommodated in the box body 10, the bottom of the box body 10 is the box body bottom plate, and the pole component 23 is arranged on a side of the shell component 21 close to the box body bottom plate, or on a side of the shell component 21 away from the box body bottom plate.

[0336] The pole part 23 of the battery cell 20 is arranged on the side of the shell part 21 close to the bottom plate of the box body, which may mean that the battery cell 20 can be inverted in the box body 10 (the pole part 23 of the battery cell 20 is arranged downward), which can help lower the center of gravity of the battery cell 20, thereby lowering the center of gravity of the entire battery device 100, and can improve the stability of the battery device 100 during installation and use, and reduce the risk of displacement or damage of the battery cell caused by external forces such as vibration and bumps. In some cases, the pole part 23 of the battery cell 20 is arranged on the side of the shell part 21 close to the bottom plate of the box body, which is also conducive to the heat dissipation of the battery device 100. For example, when the battery device 100 adopts bottom heat dissipation, since the heat of the pole part 23 is more likely to be concentrated, the heat can be more easily dissipated from the bottom of the battery cell 20 by adopting the above solution, thereby improving the heat dissipation efficiency, and the heat can be quickly exchanged from the pole part 23, which can reduce the probability of safety problems caused by overheating of the pole part 23 and improve the reliability of the battery cell 20.

[0337] The pole component 23 is arranged on the side of the shell component 21 away from the bottom plate of the box body, which may mean that the battery cell 20 can be arranged upward in the box body 10 (the pole component 23 of the battery cell 20 is arranged upward), which can make the electrical connection between the battery cells 20 easier to achieve. During the assembly process of the battery device 100, the operator can more conveniently connect and fix the bus, wires or other electrical components to improve production efficiency. Moreover, this arrangement is also convenient for electrical inspection and maintenance of the battery device 100, and when a fault occurs, it can be more easily located and repaired. In some application scenarios that require waterproofing, the above-mentioned arrangement can more easily achieve the waterproof function. Since the pole component 23 is located at the highest point of the battery cell 20, the probability of moisture entering the battery cell 20 from the pole component 23 can be reduced. In the case of water accumulation, the risk of moisture soaking the pole component 23 can be reduced, which is conducive to improving the waterproof level of the battery device 100. Secondly, the battery cell 20 can be arranged upward in the box 10, and the top of the battery cell 20 can be better protected, which is beneficial to reduce the risk of damage to the pole component 23 when external objects hit the box 10, and improve the reliability of the battery cell 20.

[0338] In the above technical solution, by arranging multiple battery cells 20 in an inverted or forward direction in the box body 10, more design solutions can be provided, thereby improving the product flexibility of the battery device 100. By arranging the pole component 23 of the battery cell 20 on the side of the shell component 21 close to the bottom plate of the box body, it is beneficial to lower the center of gravity of the battery device 100 as a whole, and it is beneficial to the heat dissipation of the battery cell 20 and the battery device 100, and the reliability of the battery device 100 can be improved. By arranging the pole component 23 on the side of the shell component 21 away from the bottom plate of the box body, it is beneficial to the electrical connection inside the battery device 100, and it is also convenient for maintenance and repair, and it can also improve the waterproof and dustproof performance of the battery device 100, and it can reduce the probability of damage to the battery cell 20 when the bottom of the box body 10 is hit, and it can also improve the reliability of the battery device 100.

[0339] An embodiment of the present application provides an electric device 1000, comprising a battery device 100 of any of the above embodiments, and the battery device 100 is used to store or provide electric energy.

[0340] In the above technical solution, since the battery cell 20 or the battery device 100 has a higher reliability, the reliability of the electric device 1000 using the battery cell 20 or the battery device 100 can be improved, and the electric device 1000 can have a better performance.

[0341] Embodiment 1

[0342] refer to Figures 3 to 5 According to an embodiment of the present application, a battery cell 20 is provided, including: a shell component 21, an electrode component 22 and a pole component 23.

[0343] The housing component 21 includes a first housing wall 201 , and the first housing wall 201 is provided with a mounting hole 201 a .

[0344] The electrode component 22 is disposed in the housing component 21 .

[0345] The pole component 23 is disposed in the mounting hole 201 a of the first shell wall 201 , and includes a pole body 231 , a clamping structure 232 , an insulating sealing structure 233 and an insulating structure 234 .

[0346] The pole body 231 is connected to the electrode component 22. The pole body 231 has a runway shape, which is composed of a rectangle 303 and two semicircles 304 at both ends of the length of the rectangle 303. The pole body 231 includes a main body 2311 and an edge portion 2312 connected to the main body 2311. The edge portion 2312 is arranged around the circumference of the main body 2311, and the thickness of the edge portion 2312 gradually decreases to form a first recessed portion 2312a on the side facing away from the first shell wall 201. The pole body 231 is a copper-aluminum composite pole, and a copper plating layer is provided on the circumferential side.

[0347] The clamping structure 232 surrounds the pole body 231 and is connected to the first shell wall 201. The clamping structure 232 is an integrally formed part, and is formed with a first clamping part 2321 and a second clamping part 2322 by riveting. The first clamping part 2321 is bent toward the second clamping part 2322 and is located on a side of the second clamping part 2322 away from the first shell wall 201. The first clamping part 2321 and the second clamping part 2322 jointly form a clamping groove 2323, and the clamping groove 2323 clamps the edge portion 2312 of the pole body 231. The clamping groove 2323 is formed with a notch 2323a, and the clamping groove 2323 is tightened at the notch 2323a to prevent the pole body 231 from escaping from the notch 2323a; wherein, along the thickness direction of the first shell wall 201, the ratio of the minimum dimension of the notch 2323a to the maximum dimension of the clamping groove 2323 is less than 90%.

[0348] The first clamping member 2321 includes a first arm portion 2301, a second arm portion 2302 and a third arm portion 2303 which are bent and connected in sequence. The first arm portion 2301 is connected to the second clamping member 2322, extends in a direction away from the second clamping member 2322, and is perpendicular to the first shell wall 201. The second arm portion 2302 is an arc-shaped arm, and the third arm portion 2303 is arranged along the direction of gradually approaching the second clamping member 2322 relative to the second arm portion 2302. The first arm portion 2301, the second arm portion 2302 and the third arm portion 2303 and the second clamping member 2322 jointly form a clamping groove 2323, and the end of the third arm portion 2303 away from the second arm portion 2302 and the end of the second clamping member 2322 away from the first arm portion 2301 jointly form a notch 2323a.

[0349] The first clamping member 2321 includes a plurality of riveted portions 301 spaced apart in a direction surrounding the pole body 231, and discontinuous notches 302 are formed between adjacent riveted portions 301. The riveted portions 301 include first riveted portions 3011 disposed at both ends of the length of the pole body 231, and second riveted portions 3012 disposed at both ends of the width of the pole body 231. The discontinuous notch 302 is formed between the first riveted portion 3011 and the second riveted portion 3012, and is disposed opposite to the connection position of the rectangle 303 and the semicircle 304.

[0350] The insulating sealing structure 233 includes a first sealing member 2331 , a second sealing member 2332 and an insulating member 2333 .

[0351] The first sealing member 2331 is a sealing ring and includes a first portion 2306 and a second portion 2307 which are bent and connected. The first portion 2306 is sealed between the main body 2311 and the second clamping member 2322 , and the second portion 2307 is sealed between the edge portion 2312 and the second clamping member 2322 .

[0352] The second sealing member 2332 is a sealing ring and is sealingly disposed between the first clamping member 2321 and the main body 2311 and the edge 2312 and is matched with the first recessed portion 2312 a . The second sealing member 2332 and the first sealing member 2331 are spaced apart from each other.

[0353] The insulating member 2333 is injection molded on an outer surface 2321 a of the first clamping member 2321 away from the clamping groove 2323 , and is partially penetrated through the discontinuous notch 302 to be connected to the second sealing member 2332 .

[0354] The insulating structure 234 is a plastic part and is disposed between the pole body 231 and the electrode component 22 . The insulating structure 234 is insulated from and sealedly connected to the second portion 2307 of the first sealing member 2331 .

[0355] Embodiment 2

[0356] Reference Fig.13 The structure of the battery cell 20 of the second embodiment is substantially the same as that of the battery cell 20 of the first embodiment, except that:

[0357] In the structure of the first clamping member 2321 , the second arm 2302 is perpendicular to the first arm 2301 and connected with the first arm 2301 by an arc transition. The third arm 2303 is connected with the second arm 2302 by an arc transition and is parallel to the first arm 2301 .

[0358] The insulating sealing structure 233 includes a first sealing member 2331 and an insulating member 2333 .

[0359] The first sealing member 2331 is a sealing ring and includes a first portion 2306 and a second portion 2307 which are bent and connected. The first portion 2306 is sealed between the main body 2311 and the second clamping member 2322 , and the second portion 2307 is sealed between the edge portion 2312 and the second clamping member 2322 .

[0360] The insulating member 2333 includes a first insulating portion 2308 and a second insulating portion 2309. The first insulating portion 2308 is injection molded between the first clamping member 2321 and the pole body 231. The second insulating portion 2309 is injection molded on the outer surface 2321a of the first clamping member 2321 away from the clamping groove 2323, and is partially penetrated through the discontinuous notch 302 and connected to the first insulating portion 2308.

[0361] It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, if there is no special explanation, all the embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution. If there is no special explanation, all the technical features and optional technical features of the present application can be combined with each other to form a new technical solution. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that: The invention comprises a shell component, an electrode component and a pole component, wherein the electrode component is arranged in the shell component, the shell component comprises a first shell wall, and the pole component is arranged in the first shell wall and comprises: A pole body connected to the electrode component; A clamping structure, surrounding the pole body and connected to the first shell wall; An insulating sealing structure is insulated and sealed between the clamping structure and the pole body; wherein the clamping structure comprises a first clamping member and a second clamping member which are connected and arranged, at least one of the first clamping member and the second clamping member is bent toward the other to form a clamping groove together; the clamping groove clamps the pole body, the clamping groove is formed with a notch, and the clamping groove is tightened at the notch to prevent the pole body from escaping from the notch; Wherein, along the thickness direction of the first shell wall, the ratio of the minimum dimension of the notch to the maximum dimension of the clamping groove is less than 90%.

2. The battery cell according to claim 1, characterized in that: The first clamping member includes a first arm portion, a second arm portion, and a third arm portion which are bent and connected in sequence, the first arm portion is connected to the second clamping member and extends in a direction away from the second clamping member, and at least one of the second arm portion and the third arm portion is extended and arranged gradually approaching the second clamping member; The first arm portion, the second arm portion, the third arm portion and the second clamping member together form the clamping groove, and the end of the third arm portion away from the second arm portion and the end of the second clamping member away from the first arm together form the notch.

3. The battery cell according to claim 2, characterized in that: The second arm portion is arranged parallel to the first shell wall, and the second arm portion is bent and connected to the first arm portion and the third arm portion; or the second arm portion is an arc-shaped arm, which is bent and connected to the first arm portion and the third arm portion.

4. The battery cell according to claim 2, characterized in that: The third arm portion is arranged at an angle relative to the first arm portion and the first shell wall; or, the third arm portion is arranged parallel to the first arm portion and is arranged at an angle relative to the first shell wall.

5. The battery cell according to claim 2, characterized in that: The first arm portion is arranged perpendicular to the first shell wall.

6. The battery cell according to claim 2, characterized in that: The second clamping member includes a fourth arm portion, the fourth arm portion is parallel to the first shell wall, and forms the clamping groove together with the first clamping member.

7. The battery cell according to claim 6, characterized in that: The second clamping member further includes a fifth arm portion, which is bent and connected to the fourth arm portion and extends in a direction close to the first clamping member.

8. The battery cell according to claim 7, characterized in that: The fifth arm portion is perpendicular to the first shell wall.

9. The battery cell according to claim 2, characterized in that: The pole body includes a main body and an edge portion connected to the main body, and the edge portion is located in the clamping groove.

10. The battery cell according to claim 9, characterized in that: The edge portion is bent relative to the main body portion as a whole.

11. The battery cell according to claim 10, characterized in that: The edge portion is at least partially arranged parallel to the third arm portion.

12. The battery cell according to claim 9, characterized in that: The edge portion is formed with a first recessed portion, and the third arm portion cooperates with the first recessed portion.

13. The battery cell according to claim 12, characterized in that: The third arm portion is protruding relative to the second arm portion in a direction close to one side of the first recessed portion, and is insulated from and sealedly connected to the first recessed portion through the insulating sealing structure.

14. The battery cell according to claim 12, characterized in that: The edge portion is further formed with a second recessed portion, and the second clamping member cooperates with the second recessed portion.

15. The battery cell according to claim 14, characterized in that: The second clamping member includes a fourth arm portion and a fifth arm portion which are connected to each other. The fourth arm portion is connected to the first arm portion, and the fifth arm portion is protruded toward a side close to the second recessed portion and is insulated and sealedly connected to the second recessed portion through the insulating sealing structure.

16. The battery cell according to claim 14, characterized in that: The first recessed portion and / or the second recessed portion is formed by partially reducing the thickness of the edge portion.

17. The battery cell according to claim 1, characterized in that: The insulating sealing structure comprises a first sealing member, and the first sealing member is sealingly arranged between the second clamping member and the pole body.

18. The battery cell according to claim 17, characterized in that: The first sealing member includes a first portion and a second portion which are bent and connected, the pole body includes a main body and an edge portion, the first portion is sealed between the main body and the second clamping member, and the second portion is sealed between the edge portion and the second clamping member.

19. The battery cell according to claim 18, characterized in that: The pole component further includes an insulating structure insulated between the pole body and the electrode component, and the second portion is integrally provided with the insulating structure.

20. The battery cell according to claim 17, characterized in that: The insulating sealing structure further includes a second sealing member, which is sealingly disposed between the first clamping member and the pole body, and the second sealing member is spaced apart from the first sealing member.

21. The battery cell according to claim 17, characterized in that: The insulating sealing structure further includes an insulating member, wherein the insulating member includes a first insulating portion and is disposed between the first clamping member and the pole body.

22. The battery cell according to claim 21, characterized in that: The insulating member further includes a second insulating portion, which is disposed on an outer surface of the first clamping member away from the clamping groove and is connected to the first insulating portion.

23. The battery cell according to claim 22, characterized in that: The pole body includes a pole outer protrusion located in the inner ring area of ​​the first clamping piece, the pole outer protrusion protrudes relative to the first clamping piece toward the outer side of the first shell wall, the side surface of the pole outer protrusion away from the electrode component includes a central area and a peripheral area, the peripheral area is arranged around the central area, the central area protrudes toward the outer side of the first shell wall relative to the peripheral area, and the side surface of the second insulating part away from the electrode component is flush with the peripheral area.

24. The battery cell according to claim 22, characterized in that: The first insulating part and the second insulating part are integrally or separately arranged.

25. The battery cell according to claim 24, characterized in that: The first insulating portion is injection-molded between the first clamping member and the pole body; and / or the second insulating portion is injection-molded on an outer surface of the first clamping member away from the clamping groove.

26. The battery cell according to claim 25, characterized in that: The first insulating portion is injection molded between the first clamping member and the pole body, and the second insulating portion is injection molded on an outer surface of the first clamping member away from the clamping groove; The first clamping member has a through hole, and part of the second insulating portion passes through the through hole and is connected to the first insulating portion.

27. The battery cell according to claim 1, characterized in that: The first clamping member and the second clamping member are integrally formed; and / or the first clamping member, the second clamping member and the first shell wall are integrally formed.

28. The battery cell according to claim 27, characterized in that: The clamping structure includes an inner ring segment and an outer ring segment arranged around the inner ring segment, the outer ring segment is connected to the first shell wall, a part of the inner ring segment forms the second clamping piece, and another part is riveted to form the first clamping piece.

29. The battery cell according to claim 1, characterized in that: The length of the second clamping member in the direction from the first shell wall to the pole body is L1, and the thickness of the second clamping member is H1, which satisfies the relationship: y=-(P·L1 4 ) / 8E(b·H1 3 / 12); Wherein, y is the disturbance of the second clamping member, which should be less than 25% of the compression of the insulating sealing structure, in units of mm; P is the maximum rebound force of the insulating sealing structure after compression, in N; E is the elastic modulus of the second clamping member, in GPa; b is the circumference of the second clamping member in the circumferential direction of the pole body, in mm.

30. The battery cell according to claim 1, characterized in that The first clamping member includes a plurality of riveted portions spaced apart in a direction surrounding the pole body, and discontinuous gaps are formed between adjacent riveted portions.

31. The battery cell according to claim 30, characterized in that: The outline of the pole body is a runway shape, which is composed of a rectangle and two semicircles located at both ends of the length of the rectangle. The riveted portion includes a first riveted portion located at both ends of the length of the pole body, and a second riveted portion located at both ends of the width of the pole body. The discontinuous notch is formed between the first riveted portion and the second riveted portion, and is arranged opposite to the connection position of the rectangle and the semicircle.

32. The battery cell according to claim 1, characterized in that The first clamping member is arranged on a side of the second clamping member away from the electrode component and is provided with an intermittent notch communicating with the clamping groove.

33. The battery cell according to claim 32, characterized in that: The number of the discontinuous notches is multiple and they are arranged at intervals along the direction in which the clamping structure surrounds the pole body.

34. The battery cell according to claim 32 or 33, characterized in that: The insulating sealing structure includes an insulating member, which includes a first insulating part and a second insulating part. The first insulating part is injection molded between the first clamping member and the pole body, and the second insulating part is injection molded on the outer surface of the clamping groove formed by the first clamping member, and is partially connected to the first insulating part through the discontinuous notch.

35. The battery cell according to claim 1, characterized in that The pole body includes a first metal part and a second metal part made of different materials. The first metal part is located on a side of the second metal part away from the electrode component. The second metal part is connected to the electrode component. The periphery of the first metal part and the periphery of the second metal part adjacent to the first metal part are both covered with a protective metal layer.

36. The battery cell according to claim 1, characterized in that The pole body is a metal piece made of the same material at all locations.

37. The battery cell according to claim 1, characterized in that The pole component defines a receiving groove that is recessed in a direction away from the electrode component, and the pole body defines a groove end wall on a side of the receiving groove away from the electrode component. The electrode component includes an active material coating portion and a conductive portion, and at least a portion of the conductive portion is received in the receiving groove and connected to the groove end wall.

38. The battery cell according to claim 37, characterized in that: The pole component further includes an insulating structure, which is arranged on a side of the clamping structure close to the electrode component. The insulating structure and the insulating sealing structure jointly define a groove peripheral wall of the accommodating groove.

39. The battery cell according to claim 1, characterized in that: The pole component also includes an insulating structure, which is arranged on a side of the clamping structure close to the electrode component. The pole body includes a pole inner protrusion located in the inner ring area of ​​the insulating structure, and the pole inner protrusion protrudes relative to the clamping structure toward the inner side of the first shell wall. A side surface of the pole inner protrusion close to the electrode component is flush with a side surface of the insulating structure close to the electrode component, or is located on a side of the side surface of the insulating structure close to the electrode component away from the electrode component.

40. The battery cell according to claim 1, characterized in that It also includes a pressure relief device, which is arranged on the shell component and is located on the same side or the opposite side as the pole component.

41. A battery device, characterized in that: Comprising a battery cell according to any one of claims 1-40.

42. The battery device according to claim 41, characterized in that The battery device comprises a box body, the battery cells are multiple and are accommodated in the box body, the bottom of the box body is a box body bottom plate, and the pole component is arranged on a side of the shell component close to the box body bottom plate, or on a side of the shell component away from the box body bottom plate.

43. An electrical device, characterized in that: Comprising a battery device according to claim 41 or 42, the battery device is used to store or provide electrical energy.

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